Answers
Based on the calculations through the ICE table, the pH of the buffer solution is equal to 3.30.
Given the following data:
Concentration of [tex]HNO_2[/tex] = 0.55 M.Concentration of [tex]KNO_2[/tex] = 0.75 M.Rate constant = [tex]6.8 \times 10^{-4}[/tex]How to determine the pH of the buffer solution.First of all, we would write the properly balanced chemical equation for this chemical reaction:
[tex]HNO_2(aq)\rightleftharpoons H^{2+} (aq)+ KNO_2^{-}(aq)[/tex]
Initial cond. 0.55M 0 0.75M
[tex]\Delta C[/tex] -x x x
At equib. 0.55M - x 0 + x 0.75M + x
From the ICE table, the Ka for this chemical reaction is given by:
[tex]K_{a}=\frac{[H^+][NO_2^+]}{HNO_2} \\\\H^+ = K_{a}\frac{[HNO_2]}{[NO_2^+]} \\\\H^+ = 6.8 \times 10^{-4} \times \frac{0.55}{0.75} \\\\H^+ = 6.8 \times 10^{-4} \times 0.733\\\\H^+ = 4.98 \times 10^{-4} \;M[/tex]
Now, we can calculate the pH of the buffer solution:
[tex]pH=-log[H^+]\\\\pH=-log[4.98 \times 10^{-4}]\\\\pH=-(-3.30)[/tex]
pH = 3.30.
Alternatively, you can calculate the pH of this buffer solution by applying Henderson-Hasselbalch equation:
[tex]pH =pka+ log_{10} \frac{A^-}{HA}[/tex]
Where:
HA is acetic acid.[tex]A^-[/tex] is acetate ion.Read more on concentration here: https://brainly.com/question/3006391
Related Questions
In Fig C, which pair of electrons is the lone pair?
H:P:H
Fig C
H
O Top
O Left
Bottom
O Right
Answers
Answer:
bottom right top left fig
Which statement describes a seismic wave during an earthquake?
A.
The wave changes directions as it is pulled by gravity.
B.
The wave changes speed as it moves through different materials.
C.
The wave loses energy to the oceans when it comes in contact with the water.
D.
The wave reflects off the surrounding rocks as it moves through the outer core.
Answers
Based on their nature of waves, seismic waves changes speed as it moves through different materials.
What are seismic waves?Seismic waves are the waves that are produced and travel through the earth crust during an earthquake.
Seismic waves are often described as elastic waves which is the energy caused by a sudden breaking of rock within the earth's crust.
Seismic waves can travel at different speeds through different types of rock, bouncing back or changing direction.
Therefore, the correct statement which describes a seismic wave during an earthquake is that the wave changes speed as it moves through different materials.
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An ion has 14 protons and a charge of “+2”. How many electrons does it have?
Answers
Answer : 12
It has a +2
Take it out from 14
When 20.4g of sodium metal are mixed with chlorine gas, are 52.0 g of sodium chloride
produced? Explain (use calculations to prove your answer.
.ves or no
-with amounts shown)
Answers
Answer: True
Explanation:
[tex]\mathrm{The\ balanced \ chemical \ equation\ is\ :}\\$2 \mathrm{Na}{(s)}+\mathrm{Cl}_{2}(g) \rightarrow 2 \mathrm{NaCl}(s)[/tex]
For Na
[tex]\\$Given mass $=20.4 \mathrm{~g}$ \ \ Molecular mass $=23 \mathrm{~g}\ \ $Number of moles $=\frac{\text { Given mass }}{\text { Molecular mass }}$$$\begin{aligned}&=\frac{20.4}{23} \\&=0.887 \text { moles }\end{aligned}$$Stoichiometric ratio of $\mathrm{Na}$ is same as that of $\mathrm{NaCl}$ i.e., $1: 1$.$\therefore$ Moles of $\mathrm{NaCl}=0.887$ motes[/tex]
For NaCl
[tex]$$\\\begin{aligned}\text { Molecular mass } &=23+35.5 \\&=58.5 \mathrm{~g}\end{aligned}$$[/tex]
[tex]\begin{aligned}\\& $\therefore$ Mass of $\mathrm{NaCl}$ produced will be=\text { No.of moles } \times \text { Molecular mass } \\&=0.887 \times 58.5 \\&=51.9 \\&\simeq 52 \mathrm{~g} \quad\end{aligned}$$[/tex]
Therefore, it is true that when 20.4g of sodium metal are mixed with chlorine gas, 52.0 g of sodium chloride is produced
Explanation:
The answer: True
I explained the answer to your question in the submitted photo
Which of the compounds below will dissociate in water? Check all that apply.
Ba(NO3)2
CaSO4
CO2
H2CO3
Mg3(PO4)2
those numbers are subscripts
Answers
An ionic compound does dissociate to a large extent in water. The compound that will completely dissociate in water here is Ba(NO3)2.
What is a soluble compound?A soluble compound is a compound that can dissociate to a large extent in water. Not all compounds are soluble in water. Only ionic compounds are soluble in water.
The compound that would dissolve in water among the list of compounds here is Ba(NO3)2.
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Answer:
A) Ba(NO3)2
B) CaSO4
C) CO2
D) H2CO3
E) Mg3(PO4)2
Explanation:
Wish I could give a good explanation, but I am still learning myself. Try searching up a video explaining this concept!
Why is the electron configuration for copper 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 4 s 1 instead
of 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 9 4 s 2 ?
A The 4 s orbital has higher energy than the 3 d orbital.
B Electrons occupy orbitals of the highest energy levels first.
C A filled sublevel is more stable than a half-filled sublevel.
Answers
Calculate the volume in mL of 0.279 M Ca(OH)2 needed to neutralize 24.5 mL of 0.390 M H3PO4 in a titration.
Note: the answer should have 3 significant digits. Do not include the unit mL in the answer.
Answers
The volume of the 0.279 M Ca(OH)₂ solution required to neutralize 24.5 mL of 0.390 M H₃PO₄ is 51.4 mL
Balanced equation2H₃PO₄ + 3Ca(OH)₂ —> Ca₃(PO₄)₂ + 6H₂O
From the balanced equation above,
The mole ratio of the acid, H₃PO₄ (nA) = 2The mole ratio of the base, Ca(OH)₂ (nB) = 3How to determine the volume of Ca(OH)₂ Molarity of acid, H₃PO₄ (Ma) = 0.390 MVolume of acid, H₃PO₄ (Va) = 24.5 mLMolarity of base, Ca(OH)₂ (Mb) = 0.279 MVolume of base, Ca(OH)₂ (Vb) =?MaVa / MbVb = nA / nB
(0.39 × 24.5) / (0.279 × Vb) = 2/3
9.555 / (0.279 × Vb) = 2/3
Cross multiply
2 × 0.279 × Vb = 9.555 × 3
0.558 × Vb = 28.665
Divide both side by 0.558
Vb = 28.665 / 0.558
Vb = 51.4 mL
Thus, the volume of the Ca(OH)₂ solution needed is 51.4 mL
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If 22.00 mL of 2.00 M potassium iodide is needed to reach the equivalence point with 18.00 mL of lead (II) nitrate, determine the molarity of the lead (II) nitrate solution. Note: First write the balance equation between potassium iodide and lead (II) nitrate.
Answers
The molarity of the lead(II) nitrate solution if 22.00 mL of 2.00 M potassium iodide is needed to reach the equivalence point with 18.00 mL of lead (II) nitrate is 1.2M.
How to calculate molarity?The molarity of a solution can be calculated using the following formula:
CaVa/CbVb = na/nb
Where;
Ca = concentration of acidCb = concentration of baseVa = volume of acidVb = volume of basena = number of moles of acidnb = number of moles of baseThe balanced equation of the reaction is as follows:
Pb(NO3)2 (aq) + 2KI (aq) → 2KNO3 (aq) + PbI2 (s)
22 × 2/18 × Cb = 2/1
44/18Cb = 2
Cb = 44 ÷ 36
Cb = 1.2M
Therefore, the molarity of the lead(II) nitrate solution if 22.00 mL of 2.00 M potassium iodide is needed to reach the equivalence point with 18.00 mL of lead (II) nitrate is 1.2M.
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Use the bond energy to calculate an approximate value of ΔH for the following reaction. Which is the more stable form of FNO2?
Answers
The Lewis structures in which there are no formal charges is the most stable. Hence, structure (b) is the more stable form of FNO2.
Lewis structureThe question is incomplete but I will try to answer you as much as I can. Now the equation is missing hence we can't numerically caculate the enthalpy chnage of the reaction from bond energies. However, we can do this using the formula; Σbond energy of reactants - bond energy of products.
Concerning the Lewis structures of FNO2, the most stable structure is structure (b) as shown in the image attached where the atoms have no formal charges.
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What is the total number of atoms contained in 3.63 moles of nickel?
Answers
Answer:
Explanation:
1 mole of nickel contains 6.02 * 10^23 atoms
3.63 mols of nickel contain x atoms.
What you have is a proportion. A proportion consists of 2 ratios or 4 parts.
Of the 4 parts, you know three of them. The problem is to solve for the 4th.
1/3.63 = 6.02*10^23 / x Cross multiply
x = 3.63 * 6.02* 10^23 Combine the right.
Answer: x = 2.19*10^24 atoms
Explain how oxygen and carbon dioxide move with breathing.
Answers
Answer/Explanation:
With oxygen, it is what you breathe in so obviously, it is going to move around into your body. But with carbon dioxide, it is what you breathe out. When you breathe in, your body takes in the oxygen and the releases the carbon dioxide. Carbon dioxide is what plants actually consume, while they release oxygen.
I hope this helps!
-No one
Amory turns the light on in her house. Looking at the lights, she begins to wonder how the charges are moving through the bulb. Which statement best describes how the charges move through the bulb ?
Answers
The statement 'when charges pass through the bulb, light is produced' best describes how the charges move through the bulb.
What is an electrical charge?An electrical charge is a type of positive or negative charge of the particles that move in a conductor.
At the atomic level, protons are positively charged particles, electrons are negative, and neutrons do not have a charge.
The electrical charges depend on the charge's initial time, the final time, and the net outward current.
Learn more about electrical charges here:
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What do ferns and gymnosperms have in common?They are all vascular plants.
Reproduction depends on birds, bees, and other animals.
They all produce seeds.
They depend on water for fertilization.
Answers
Answer:
They are all vascular plants.
Explanation:
Vascular plants, also known as tracheophytes, are highly advanced plant creatures with leaves, stems, and roots, as well as a vascular system made up of conducting vessels. Ferns are herbaceous, pteridophytic vascular plants that do not produce flowers or seeds. Gymnosperms are vascular plants that produce seeds but do not produce blooms. Because the seeds aren't covered or protected by an ovary, they can be seen on the plant's leaves or other components. Angiosperms are flowering plants containing seeds that develop inside the ovary, which develops and produces fruit.
Answer:
They all produce seeds
Explanation:
Consider the structure shown.
A central S atom is bonded to three O atoms, two through a single line and one through two lines. There are six dots around two of the O atoms and 4 dots around the third O atom.
Determine the number of shared and unshared electrons in the structure.
shared (bonding) electrons:
unshared (lone, nonbonding) electrons:
Determine the number of shared and unshared pairs of electrons in the structure.
shared (bonding) pairs of electrons:
unshared (lone, nonbonding) pairs of electrons:
Determine the total number of valence electrons in the structure.
total valence electrons:
Answers
There are eight lone pairs and four bond pairs of electrons in the SO3 molecule. The valence electrons are found on the valence shell of the molecule.
Lewis structure of SO3The molecule SO3 is represented by the Lewis structure shown in the image attached to this answer. The central atom in the molecule is sulfur.
There are sixteen non bonding electrons in the molecule and eight bonding electrons in the molecule Hence, we have eight lone pairs and four bond pairs of electrons in the molecule as shown in the Lewis structure.
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Kinetic friction is the frictional force needed to start an object at rest into
motion.
O A. True
O B. False
Answers
Answer:false you are welcome
Explanation:
Answer: False I hope this helpful please mark me brainlist
Explanation:
Kinetic friction is the friction acting upon a moving object. It would be the frictional force against you if you pulled a box across a table.Static friction is the frictional force needed to overcome to get an object at rest into motion.
Looking at the figure, the overall (SiO4) molecule, which forms the common mineral quartz, has a tetrahedral shape. It is probably a:
non-polar molecule
polar molecule
Answers
non-polar molecule because the chemical formula is in a tetrahedral form(O4) and the (Si) is in the centre. I hope this will help you
What volume of .15M NaOH could be produced with only 5 grams of NaOH and water?
Answers
The volume of 0.15M NaOH that could be produced with only 5 grams of NaOH and water is 0.83L.
How to calculate volume?The volume of a substance can be calculated using the following expression:
Molarity = number of moles ÷ volume
The number of moles of NaOH can be calculated by dividing the mass of NaOH by its molar mass.
Molar mass of NaOH = 40g/mol
n = 5/40
n = 0.125moles
Volume of NaOH = 0.125mol ÷ 0.15M
Volume = 0.83L
Therefore, the volume of 0.15M NaOH that could be produced with only 5 grams of NaOH and water is 0.83L.
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At 4.5 atm of pressure, the solubility of a gas is 9.5 g/L.
How much gas, in grams, will dissolve in 1 L if the pres.
sure is reduced by 3.5 atm?
Answers
For a gas at 4.5 atm of pressure, the solubility of a gas is 9.5 g/L.
How much gas, in grams, is mathematically given as
s2=8.3782grams
What is the amount of gas in grams?Generally, the equation for the is mathematically given as
Si /S2 √P1/√P2
Therefore
[tex]s2=9.5*\sqrt{3.5}/\sqrt{4.5}[/tex]
s2=8.3782g
In conclusion. The solubility is
s2=8.3782g
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What are the processes that lead to the formation of sedimentary rocks? I WILL GIVE BRAINLIEST
A.weathering and erosion followed by dispersion.
B.volcanic eruptions followed by dispersion,
C. volcanic eruptions followed by compaction
D.weathering and erosion followed by compaction
Answers
Answer:
erosion, weathering, dissolution, precipitation, and lithification So,D.weathering and erosion followed by compaction
Explanation:
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• How do the physical and chemical properties of each packaging type help create new and better product?
Answers
Answer:
chemical composition and physical properties of packaging materials determine their ability to fulfill the various functions expected from the package.
According to the given equation, how many moles of O, are required to react with 4.71 moles of C4H10?
2C4H10 + 1302 —8CO2 + 10 H
Answers
According to the given equation, 2C4H10 + 1302 — 8CO2 + 10H, 2 moles of O are required to react with 4.71 moles of C4H10.
How to calculate number of moles?The number of moles of a compound can be calculated stoichiometrically as follows:
The balanced chemical equation is given as follows:
2C4H10 + 1302 — 8CO2 + 10H
Based on the above equation, 2 moles of C4H10 reacts with 13 moles of O
Therefore; 4.71 moles of C4H10 will react with 4.71 × 6.5 = 30.62 moles of O
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Answer: 30.6
Explanation:
determine the degree of ionization at pH 2.0
Answers
Answer:
answer in the picture above
please help, I'm giving brainliest. Explain the term'wear acid'.
Answers
Weak acids are acids that don't completely dissociate in solution. In other words, a weak acid is any acid that is not a strong acid. The strength of a weak acid depends on how much it dissociates: the more it dissociates, the stronger the acid.
Amphetamine (C9H13N) is a weak base with a pKb of 4.2.
Calculate the pH of a solution containing an amphetamine concentration of 215 mg/L .
Express your answer to two decimal places.
Answers
Weak base: [OH⁻] = √Kb.C
pKb = 4.2
[tex]\tt Kb=10^{-4.2}[/tex]
c = concentration
MM Amphetamine (C9H13N) = 135.21 g/mol
c = 215 mg/L = (0.215 g : 135,21 g/mol) / L = 0.00159 mol/L = 1.59 x 10⁻³ mol/L
[tex]\tt [OH^-]=\sqrt{10^{-4.2}\times 1.59\times 10^{-3}}=3.17\times 10^{-4}[/tex]
pOH = 4 - log 3.17
pH = 14 - (4 - log 3.17)
pH = 10 + log 3.17 = 10.50
NH4NO3+Zn(OH)2
Balance the equation
Answers
Answer:
Balanced equation: Zn (NO 3) 2 + 2 NH 4 OH = 2 NH 4 NO 3 + Zn (OH) 2 Reaction type: double replacement
Explanation:
Nitrogen (iv) oxide is passed through the combustion tube before copper is heated.Give a reason for this?
Answers
to generate steam which act on copper
what is safe storage of produced materials exlain long
Answers
Answer:
Stacking storage sacks/ bags by interlocking, and placing heavier object on lower shelves.
Explanation:
Not sure what you meant exactly, but this is my best guess.
In picture 4, the net force on the car is mostly the result of? A. Gravity. B. Constant velocity. C. Wind. D. Friction.
Answers
Answer:
D beacuse I think that's Force
How much 1.75 M H3PO4, in mL, would you need to add to 50.00 mL of 3.50 M Ca(OH)2 in order to neutralize the solution
Answers
The volume of the 1.75 M H₃PO₄ solution required to neutralize 50 ml of 3.5 M Ca(OH)₂ solution is 66.67 mL
Balanced equation2H₃PO₄ + 3Ca(OH)₂ —> Ca₃(PO₄)₂ + 6H₂O
From the balanced equation above,
The mole ratio of the acid, H₃PO₄ (nA) = 2The mole ratio of the base, Ca(OH)₂ (nB) = 3How to determine the volume of H₃PO₄ Molarity of acid, H₃PO₄ (Ma) = 1.75 MVolume of base, Ca(OH)₂ (Vb) = 50 mLMolarity of base, Ca(OH)₂ (Mb) = 3.5 MVolume of acid, H₃PO₄ (Va) =?MaVa / MbVb = nA / nB
(1.75 × Va) / (3.5 × 50) = 2/3
(1.75 × Va) / 175= 2/3
Cross multiply
1.75 × 3 × Va = 175 × 2
5.25 × Va = 350
Divide both side by 5.25
Va = 350 / 5.25
Va = 66.67 mL
Thus, the volume of the H₃PO₄ solution needed is 66.67 mL
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What does absolute zero physically mean at the particle level?
ASAP!
Answers
Answer:
Absolute zero is the lowest limit of the thermodynamic temperature scale, a state at which the enthalpy and entropy of a cooled ideal gas reach their minimum value, taken as zero kelvin.