The correct chemical formula of magnesium bromide is MgBr₂.
Ionic bonds are formed by transfer of electrons between metal and non metals.
Electronic configuration of magnesium:
[Mg] :12 : 1s², 2s², 2p⁶, 3s²
Magnesium atom will lose two electron to gain noble gas configuration and form magnesium cation with +2 charge.
[Mg²⁺] : 1s², 2s², 2p⁶
Electronic configuration of bromine:
[Br] : 35 : 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁵
Bromine atom will gain one electron to gain noble gas configuration and form bromide ion with -1 charge.
[Br⁻] : 36 : 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶
In magnesium bromide, two electrons from metal gets transferred to bromine atom and thus form an ionic bond to give MgBr₂.
To know more about Ionic bond visit the link:
https://brainly.com/question/11527546?referrer=searchResults
#SPJ4
How many moles are in 175.9 g of Krypton?
Answer:
2.09 molesExplanation:
We can find the number of moles from the given mass of the element by using the formula
[tex]n = \frac{m}{M} \\ [/tex]
m is the mass
M is the molar mass
n is the number of moles
The molar mass of krypton is 84 g/mol
We have
[tex]n = \frac{175.9}{84} = 2.094\\ [/tex]
We have the final answer as
2.09 molesHope this helps you
a gas expands against a constant external pressure of 1.15 atm: the initial volume of the gas is 0.150 l and the final volume is 1.65 l. calculate wgas.
The work done by the gas that expands at constant external pressure ( isobaric expansion) is 174.8 J
What is the work done by the gas that expands at constant external pressure?The work done by the gas that expands at constant external pressure is work done under isobaric conditions.
The work done by an isobaric expansion is calculated with the formula below:
Work done = P (Vf − Vi)
where;
P is pressureVf is final volume of gasVi is initial volume of gasP = 1.15 atm
P is converted to N/m² and volume is converted to m³
1.15 atm = 1.15 * 101325 N/m²
P = 116523.75 N/m²
Vf = 1.65 * 10⁻³ m³
Vi = 0.15 * 10⁻³ m³
W = 116523.75 N/m² ( 1.65 * 10⁻³ m³ - 0.15 * 10⁻³ m³)
Work done = 174.8 J
Learn more about isobaric expansion at: https://brainly.com/question/12697402
#SPJ1
A solution of potassium hydroxide (KOH) is added to a solution of hydrochloric acid. How many moles of potassium hydroxide would react with 1 mole of hydrochloric acid? (Hint: It may help to write out a balanced symbol equation for the reaction.)
The number of moles of potassium hydroxide that would react with 1 mole of hydrochloric acid would be 1 mole.
Stoichiometric mole ratio
The stoichiometric moles of species of a reaction are the coefficients of each species in the balanced symbol equation of the reaction.
The balanced equation of the reaction between potassium hydroxide (KOH) and hydrochloric acid (HCl) is expressed as follows:
[tex]KOH + HCl --- > KCl + H_2O[/tex]
In this case, the stoichiometric mole of KOH is 1, that of HCl is 1, that of KCl is 1, and that of [tex]H_2O[/tex] is also 1.
In other words, the stoichiometric mole ratio of KOH and HCl is 1:1. For every 1 mole of KOH, 1 mole of HCl is required for a complete reaction.
Now, the question says what mole of potassium hydroxide will be required to react with 1 mole of hydrochloric acid?
Following the mole ratio, 1 mole of KOH will also be required.
More on mole ratios can be found here: https://brainly.com/question/15288923
#SPJ1
What trend does the reactivity of most nonmetals show in a periodic table, excluding the noble gases?
random changes without any trends on the periodic table
changes according to trends on the periodic table
increases from left to right across the periodic table
decreases from left to right across the periodic table
The trend which depicts the reactivity of most nonmetals show in a periodic table is that it increases from left to right across the periodic table and is denoted as option C.
What is Periodic table?This is referred to as the tabular arrangement of elements into groups and periods which is according to their similar features such as reactivity, number of electron shells etc.
When considering the periodic table, the reactivity of most nonmetals such as oxygen decreases top down within groups and increases from left to right across period which is therefore the reason why it was chosen as the most correct choice.
Read more about Periodic table here https://brainly.com/question/15987580
#SPJ1
Answer:
B
Explanation:
c isnt right
CH3F is a polar molecule, even though the tetrahedral geometry often leads to nonpolar molecules. explain.
Explanation:
A. Even though CH3F has a tetrahedral geometry, the molecule is not symmetric due to the presence of the fluorine atom in the structure resulting in the molecule being polar.
B. None of the above gives a valid explanation.
C. Even though CH3F has a tetrahedral geometry, the carbon atom in the molecule, being the central atom, is more electronegative than the hydrogen and fluorine atoms in the molecule resulting in the molecule being polar.
D. Even though CH3F has a tetrahedral geometry, the fluorine atom in the molecule, being the central atom, is more electronegative than the hydrogen and carbon atoms in the molecule resulting in the molecule being polar.
E. Even though CH3F has a tetrahedral geometry, the hydrogen atoms in the molecule are more electronegative than the fluorine resulting in the molecule being polar.
a student prepared an agno3 (aq) stock solution by dissolving an unknown mass of agno3 in a 250.00 ml volumetric flask and filling to the line with water. the student added 25.059 ml of the stock solution to a 500 ml volumetric flask and filled to the line with water to make 500 ml of a 9.443x10-3 m agno3 solution? what mass (in g) of agno3(s) did the student add to the 250 ml volumetric flask to make the stock solution?
Using the molarity of the final solution and the molar mass of silver nitrate, we can calculate that the student used 8.0015 g of silver nitrate to make the stock solution.
First, we calculate the number of moles in the 500.00 mL flask using the molarity (c) of the final solution and its volume (V = 500.00 mL = 0.50000 L).
c = n/V ⇒ n = c*V
n = 9.443 * 10⁻³ M * 0.50000 L
n = 4.7215 * 10⁻³ mol
This same number of moles was in the 25.059 mL solution that was subsequently diluted to 500.00 mL. Knowing this, we can make a simple proportion to calculate the number of moles present in the original 250.00 mL:
4.7215 * 10⁻³ mol : 25.059 mL = X : 250.00 mL
X = 4.7215 * 10⁻³ mol * 250.00 mL / 25.059 mL
X = 0.047104 mol
That's the amount (n) of silver nitrate used to make the stock solution. Now we can convert it to mass (m) by using the molar mass of silver nitrate (M = 169.87 g/mol):
n = m/M ⇒ m = n*M
m = 0.047104 mol * 169.87 g/mol
m = 8.0015 g
You can learn more about molarity here:
brainly.com/question/2817451
#SPJ4
under normal conditions, the exhaust gas from a well controlled coal burning power plant contains 12 ppmv sulfer dioxide (so2. the exhaust into the atmosphere has a temperature of 100c, determine the concentration of so2 emitted on a hg/m3 basis
The concentration of so2 emitted on a hg/m3 basis is 0.01 M.
Concentration is the abundance of a constituent divided through the full extent of an aggregate. several styles of mathematical description can be distinguished: mass attention, molar awareness, range attention, and quantity attention.
Given the 5 ppmv SO2 and we need to calculate the concentration of SO2 emitted on a µg /m3 basis.
We know,
mg/m3 = ppmv * M/0.08205*T
M = molecular weight of gas = 64.064 g/mol
mg/m3 = 5 ppmv *64.064 g.mol-1/ 0.08205 * 273.15 K
= 14.28 mg/m3
Now we know
1 mg = 1000 µg
So, 14.258 mg =?
= 14280 µg/m3
We are given partial pressure. P = 0.1 atm.
Henry’s law constant = 0.1 mole/(liter.atm)
C = Kh*P
= 0.10 mol/L.atm * 0.10 atm
= 0.01 mol/L
= 0.01 M
So, the equilibrium concentration of a gas in water is 0.01 M.
Learn more about concentration here:-https://brainly.com/question/17206790
#SPJ4
why should we care if people in other parts of the world pollute their drinking water?
Answer: This may seem unlikely for whereever you're living but say if a drought happened in your country and water is very limited, then we'd have to import water from other countries but if their water is unclean then we also have a problem of no water. Most bottled water sold in stores comes from other countries aswell.
which factors influence bond lengths? choose all that apply. which factors influence bond lengths?choose all that apply. triple bonds are shorter and stronger than double bonds. larger atoms have shorter bond lengths. double bonds are shorter and stronger than triple bonds. smaller atoms have shorter bond lengths. single bonds are shorter and stronger than double bonds. double bonds are shorter and stronger than single bonds.
Factors influence bond lengths are smaller atoms have shorter bond lengths. double bonds are shorter and stronger than single bonds.
Bond order, or the number of chemical bonds between a pair of atoms, is a measure of a bond's stability. For instance, the bond order in diatomic nitrogen, NN, is 3, while in acetylene, HCCH, the carbon-carbon bond order is also 3, while the CH bond order is 1. Bond type and bond strength are determined by bond order and length between atoms. The relationship between bond order and length is inverse: as bond order rises, bond length falls.
When two atoms come together to form a molecule, their electrons join forces by fusing into gaps in one another's orbital shells.
learn more about bond lengths here :
https://brainly.com/question/14924352
#SPJ4
silver is often extracted from ores such as k[ag(cn)2] and then recovered by the reaction (a) how many molecules of zn(cn)2 are produced by the reaction of 35.27 g of k[ag(cn)2]? (b) what mass of zn(cn)2 is produced?
a.) 5.34102 Zn(cu)2 molecules are formed.
b.) The mass of Zn(cu)2 formed is 10.41 g at 117.44 g/mol
The entire numbers next to each component of the reaction should be noted because they will be necessary for the stoichiometric calculations that follow:
K[ag(CN)2] has a molar mass of 199 g/mol.
Zn(Cn)2 has a molar mass of 117.44 g/mol.
6.022 x 1023 molecules per mole is Avogadro's number.
a.)
35.27 g* (199 g/1 mol) x (1 mol Zn(Cn)2/ 2 mol K[Ag(CN)2]) x
(6.0221023 molecules/mol) = 5.341022 Zn(Cn)2 molecules.
b.)
35.27 g x (199 g/1 mol) x (1 mol Zn(Cn)2/ 2 mol K[Ag(CN)2]) x
Zn(Cn)2 equals 10.41 g at (117.44 g/mol).
Learn more about chemical equations at
https://brainly.com/question/7283799
#SPJ4
From ores like k[ag(CN)2], silver is frequently removed before being recovered by reaction and 5.34102 Zn(Cu)2 molecules are formed and the masses of Zn(Cu)2 formed is 10.41 g at 117.44 g/mol.
It is important to take notice of the whole numbers next to each reaction component because the following stoichiometric calculations will require them:
The molar mass of K[ag(CN)2] is 199 g/mol.
The molar mass of Zn(Cn)2 is 117.44 g/mol
Avogadro's number is 6.022 x 1023 molecules per mole.
a.) 35.27 g* (1 mol Zn(Cn)2/ 2 mol K[Ag(CN)2]) x (199 g/1 mol) x
5.341022 Zn(Cn)2 molecules =
6.0221023 molecules/mol.
b.) 35.27 g x (1 mol Zn(Cn)2/ 2 mol K[Ag(CN)2]) x (199 g/1 mol) x
10.41 g of Zn(Cn)2 are,
= 117.44 g/mol.
To know more about chemical equations, refer to the link below.
https://brainly.com/question/7283799
#SPJ4
How many isotopes does Potassium have?
Here is my work:
Potassium have three isotopes.
How many different isotopes are there overall?254 stable isotopes are known. Certain substances can only exist in unstable states (for example, uranium).
The stable potassium isotope has a nuclear spin of 3/2, a relative atomic mass of 38.963707, and a natural abundance of 93.3 atoms.
We must compute for the various atomic weights of the isotopes since potassium has three distinct isotopes: Potassium-39 has an atomic mass of 39 and 19 protons. Therefore, the number of neutrons is 39 – 19, or 20.
If potassium has an atomic mass of 39.0983, the average is obviously highly biassed in favour of potassium-39, making potassium-39 the isotope with the greatest abundance.
learn more about isotope refer
https://brainly.com/question/14220416
#SPJ13
Which set of numbers will balance the following equations? 1's have been included for clarity.__Mn3N4 + __NaF --> __MnF4 + __Na3N a 1; 4; 1; 4 b 1; 4; 3; 2 c 1; 12; 3; 4 d 3; 2; 3; 2
ANSWER
Option C
EXPLANATION
Given that;
[tex]\text{ ----- Mn}_3N_4\text{ }+\text{ ---- NaF }\rightarrow\text{ ---- MnF}_4\text{ }+\text{ ---Na}_3N[/tex]In the reaction above, we have the following data
At the reactants side;
3 atoms of manganese
4 atoms of nitrogen
1 atom of sodium
1 atom of fluorine
At the products side
1 atom of manganese
4 atoms of fluorine
3 atoms of sodium
1 atom of nitrogen
To balance the above equation, apply the law of conservation mass
Law of conservation of mass states that matter can neither be created nor destroyed but can e transformed from one formato another.
To balance the equation, 1 mole of Mn3N4 reacts with 12 moles of Na Tto give 3 moles of MnF4 and 4 moles of Na3N
So, the new equation becomes
[tex]\text{ Mn}_3N_4\text{ }+\text{ 12NaF }\rightarrow\text{ 3MnF}_4\text{ }+\text{ 4Na}_3N[/tex]The following data can be deduced in the above equation
At the reactants side
3 atoms of Mn
4 atoms of N
12 atoms of Na
12 atoms of F
At the products side
3 atoms of Mn
12 atoms of F
12 atoms of Na
4 atoms of N
Looking atthe vabove data, the number of atoms of each element at the reactants side is equal to the number of atoms of same elements at the products side.
Hence, the correct answer is option Ce
u
Question 5(Multiple Choice Worth 2 points)
(14.01 LC)
What is the function of the outer covering in fish?
Answer:
Protects the fish from their environment.
Explanation:
Fish have a mucus on their outer covering that is very slimy and slippery; this serves as a benefit for the fish that will allow it to swim more easily in water.
It also works as a little suit of armor for the fish to protect themselves against predators.
which of the following properties is typically used to identify whether a bond is polar, nonpolar, or ionic? a. atomic mass. b. electronegativity. c. atomic radius. d. ionization energy.
to know more about chemical bond, go to:
brainly.com/question/15444131
#SPJ4
Determine the validity of the following experiment based on the trend of the results.
This graph shows acceleration over pulling force. Both axes are labeled and have units. There is no title. The data increases steadily from (0.1, 0.8) to (0.6, 3.4). The best fit line crosses the y axis at 0.4.
A. Experiment’s results vary greatly from the best fit line; this variation means the data is not reliable.
B. Experiment’s results vary greatly from the best fit line; this variation means the data is reliable.
C. Experiment’s results lie close to the best fit line and have no noticeable outliers; it is not reliable.
D. Experiment’s results lie close to the best fit line and have no noticeable outliers; it is reliable.
From the slope of the graph, the experiment’s results lie close to the best fit line and have no noticeable outliers; it is reliable; option D
What is a line of best fit?A line of best fit is a line that plots a range of data to the approximately best value.
The line of best will minimized the variation between several points in the data.
Considering the data points plotted, the slope of the whole line can be derived as:
slope = Δy / Δx
slope = (3.4 - 0.8) / (0.6 - 0.1)
slope = 5.2
Taking the slope from the intercept of the line of best fit on the y-axis
Slope = (3.4 - 0.4) / (0.6 - 0.0)
slope = 5.0
Therefore, the data is reliable.
Learn more about the line of best fit at: https://brainly.com/question/1518824
#SPJ1
List three specific examples of a physical change.
Answer:
Cutting hair is a physical change since it doesn't change the substance its still hair
bending a paper clips since it's also the same substance
Ice cube melting
Explanation:
All of these are physical change since there reversible and they all still stay the same substance
What advantages exist when using the balloons to model molecular shapes verses using model kits?.
Balloons can be used to mimic the morphologies of covalently bound chemical molecules. Many students struggle to visualize the shapes. The balloons are superior (and less expensive) than typical ball and stick model kits. The balloons in this exercise represent pairs of electron-electron clouds, not atoms.
Each balloon is an electron domain (either a bonded pair or a lone pair of electrons) that surrounds a core atom. When balloons are linked, they spontaneously adopt the lowest energy structure suggested by the VSEPR model.
Learn more about VSEPR model here:
https://brainly.com/question/28355903
#SPJ4
are Index fossils useless or not useless why or why not? (25 pts)
Answer:
Useful
Explanation:
Index fossils are believed to be useful in correlating rock strata from widespread locations.▸ The collection of such fossils from different rock formations and layers enables the geologists to identify the layer of rock they were found in.
▸ They are also useful in dating and the study of geological formations which help scientists to get a clear understanding of the environment and the life forms that dwelt on the planet even hundreds of millions of years ago.
Have good day♡
when a condensed fuel, such as a candle or a pool of gasoline, burns, a portion of the heat of the gaseous flame is transferred to the fuel, causing it to gasify. when this gasification occurs without chemical decomposition of the molecules, it is:
The process of gasification that occurs without the chemical decomposition of the molecules is pyrolysis.
Pyrolysis is the process of heating substances especially organic materials in absence of oxygen as oxygen is not involved combustion does not occur rather a biomass thermally decomposes into combustible gases and other products.
when condensed fuel such as a candle or pool of gasoline burns the heat produced makes them convert into smaller fragments in absence of air through the application of heat.
The heat produced is responsible for gasification and responsible for thermal combustion without the usage of oxygen making them remain than combustion over oxygen which ensures complete decomposition.
To learn more about combustion see:
https://brainly.com/question/14104327?referrer=searchResults
#SJP4
What test can reveal the presence of calcite?
Describe some rock formations that are likely to be made of calcium carbonate
help pleasee
A good test for calcite is the test using acid and a rock formation that contains calcite is limestone.
What is calcite?We know that rock has to do with a solid mass that contains minerals. We know that many rocks are composed of various kinds of minerals that could be found inside the rocks. One of the minerals that could be found in rock is calcite which is composed of calcium carbonate. The presence of calcite can be tested by that addition of an acid which leads to the effervescence of a colorless odorless gas.
The rock formations that contain calcite are mainly limestone and and are known for their grey or white color.
Learn more about calcite:https://brainly.com/question/16855546
#SPJ1
the best water for preparing side-bench reagents is
A. river water B. warm water C. distilled water D. tap water
Answer:
the answer is C.Distilled or deionized water.
The diagram shows one period of the Periodic Table. Li ,Be ,B , C,N,O,F,Ne .Which two elements form acidic oxides?
A -carbon and lithium
B -carbon and neon
C- carbon and nitrogen
D-nitrogen and neon
Answer:
A -carbon and lithium.
Explanation:
Carbon and lithium are two elements form acidic oxides.
What are Acidic oxides?One or more oxygen atoms are joined with another element to form a chemical molecule known as an oxide (for instance, Li2O).
The term "oxide" refers to a binary compound containing oxygen and another element, such as CO2, SO2, CaO, CO, ZnO, BaO2, and water. Because oxygen is combined with just one other element in these substances, they are referred to as oxides. Oxides are divided into acidic, basic, amphoteric, and neutral categories based on their acid-base properties:
An oxide is referred to as acidic if it reacts with water to form an acid. A basic oxide is an oxide that produces a base in water. A substance that can chemically react as either an acid or a base is called an amphoteric solution.
Therefore, Carbon and lithium are two elements form acidic oxides.
To learn more about Oxides, refer to the link:
https://brainly.com/question/9496279
#SPJ2
the number of atoms in 0.009567 mole of HBrO3 is
Avogadro's Number:
Avogadro's number, which is equal to 6.02214076 x [tex]10^{23}[/tex], is the quantity of units in one mole of any material. Hence, 1 mole of HBrO3 will contain
6.02214076 x [tex]10^{23}[/tex] atoms.
Then, 0.009567 mole of HBrO3 will contain
= 0.009567 moles x 6.02214076 x [tex]10^{23}[/tex] atoms
= 0.0576138 x [tex]10^{23}[/tex] atoms = 5.761 x [tex]10^{21}[/tex] atoms.
Hence, 0.009567 mole of HBrO3 will contain 5.761 x [tex]10^{21}[/tex] atoms.
To know more about Avogadro's number, visit,
https://brainly.com/question/28919533
#Avogadro's number
PLEASE SOMEONE HELP EXPLAIN THIS IT’S DUE FIRST THING TMRW MORNING!!
Determine the empirical formula of a 28.00 gram sample containing 22.90 grams carbon and 5.10 grams hydrogen.
Answer:
CH3
Explanation:
Hope this helps :)
Metal and non-metal ions come together to form a giant structure. What is the name of this structure?
A. Ionic bond
B. Ionic lattice
C. Ionic molecule
Answer:
This arrangement is called a giant ionic lattice .
Forming ionic compounds -
Answer: It form ionic bond.
Explanation: It forms when atoms of a metallic element give up electrons to atoms of a nonmetallic element. Ionic bonds form only between metals and nonmetals. That's because metals “want” to give up electrons, and nonmetals “want” to gain electrons.
a certain compound is found to have the percent composition (by mass) of 85.63% c and 14.37% h. the molecular formula contains 6 carbon atoms. how many hydrogen atoms are contained in a molecular of this compound?
A molecular of this compound contains 6 hydrogen atoms. An atom is a component of an element. Each atom in a specific element has only one type of atom. Electrons, protons, and neutrons
What is meant by atom?An atom is the smallest component of ordinary matter that makes up a chemical element. Every solid, liquid, gas, and form of plasma is made up of neutral or ionized atoms. Atoms are extremely small, with a diameter of 100 picometers on average.A chemical element is defined by its atoms, which are small pieces of matter. An atom consists of a core nucleus and one or more negatively charged electrons that orbit around it. The positively charged, somewhat massive protons and neutrons that comprise the nucleus may exist.The modern atomic concept was first proposed by eminent chemist John Dalton (1766–1844). But his atom was as solid as a cue ball.To learn more about atom, refer to:
https://brainly.com/question/23390564
#SPJ1
Name the following covalent bond Ch4
Answer:
sp³-s sigma bond.
Hope that was the answer
A substance made up of only one kind of atom is called
A substance made up of only one kind of atom is called Elements.
An element is a pure substance made up of only one kind of atom. A compound is substance made up some of more than one element. in some of the elements atoms are joined in groups of two or more called as molecule . example : oxygen is an element made up of only one kind of atom that is oxygen atoms. there are 118 known elements , and are represented on the periodic table.
Thus, A substance made up of only one kind of atom is called Elements.
To learn more elements here
https://brainly.com/question/8396323
#SPJ1
in the rate law the exponents associated with the concentration of each reactant are referred to as the order of the reaction with respect to that reactant. why are we not able to use the stoichiometric coefficients in the balanced equation for the orders in the rate law?
A chemical reaction's rate and the concentrations of the reactants involved are correlated by an expression known as the rate law, commonly referred to as the rate equation.
In a rate law, what do the exponents stand for?The rate equation's "orders," the exponents a and b, must be established empirically. The exponents are added to determine the reaction's overall order. In other words, the reaction is third order overall if a=1 and b=2.
By adding together the different orders, the reaction's overall order can be determined. For instance, the overall order is 2 if the reaction is first order with regard to both A and B (a = 1 and b = 1). This is referred to as a global second order response.
Finding a Rate Law's Exponents from Initial Rates (Experimental Data)
The concentrations of all the species for which data are provided should be included in the rate law. ...Consider the experimental data's ratios for the various rates.Delete common phrases, then find the exponent that doesn't disappear.The molar concentrations of the reactants are used by the rate law to calculate the reaction rate. Because there are more molecules colliding and reacting with one another, reactions often proceed more quickly at higher reactant concentrations.
The exponents of a rate law's concentration terms are added to determine its order. The rate law of a reaction can be utilized to better understand the makeup of the reaction mixture once it has been established.
To Learn more about rate law, Refer:
https://brainly.com/question/16981791
#SPJ4
what other combination of phosphoric acid and its salts could be mixed to prepare this buffer? h3po4 and nah2po4 h3po4 and na2hpo4 na2hpo4 and na3po4 h3po4 and na3po4 nah2po4 and na3po4
The mass of each salt which will be added to the mixture is:
NaH₂PO₄ = 1.876 g
Na₂HPO₄ = 4.879 g
To make this buffer, phosphoric acid and/or its salts can also be combined in the following ways:
H₃PO₄ and Na₂HPO₄;
H₃PO₄ and Na₃HPO₄
The acid must be in the second ionisation if we are to have a buffer at 7.540, thus we would pick pKa2 = 7.198 for the buffer capacity.
7.540 = 7.198 + log[A⁻]/[HA]
log[A⁻]/[HA] = 0.342
[A⁻]/[HA] =
[A⁻]/[HA] = 2.198
[A⁻] = 2.198*[HA]
The concentration of the acid is conjugated to base and must be equal to the concentration of the buffer 0.0500 M, so:
[A⁻] + [HA] = 0.0500
2.198*[HA] + [HA] = 0.0500
3.198*[HA] = 0.0500
[HA] = 0.01563 M
[A⁻] = 0.0500 - 0.01563
[A⁻] = 0.03436 M
The mixed reaction is: NaH₂PO₄ + Na₂HPO₄ → HPO₄⁻² + 3Na + H₂PO₄⁻
The second ionization is:
H₂PO₄⁻ ⇄ HPO₄⁻² + H⁺
Because H₂PO₄⁻ is the acid form, its concentration is the same as NaH₂PO₄, and HPO₄⁻² is the conjugated base, and its concentration is the same as Na₂HPO₄ (stoichiometry is 1:1 for both).
If you want to prepare something for buffering, you must first have a solution of the species H2PO4 and HPO42, so that you can mix the mixture of:
H3PO4 and Na2HPO4 (the acid is tricrotic, forming H2PO4 as a result),
The dissociation of the salt Na2HPO4 into Na+ and HPO42);
Learn more about salt:
https://brainly.com/question/13818836
#SPJ4