Question 1

The amino acid alanine,HOOC-CH(CH3)NH3+,has Ka1 = 4.5 * 10-3 and Ka2 = 1.4 * 10-10.Calculate $\alpha$(-OOC-CH(CH3)NH3+)at pH 10.

Accepted Answer

A) 0.42 
B) 0.29 
C) 1.0 
D) 0 
E) 0.58 
A) 0.42 
B) 0.29 
C) 1.0 
D) 0 
E) 0.58

Question 2

In liquid ammonia,the base B is a strong base if it is a stronger proton acceptor than NH2-.

Accepted Answer

A) True 
 B)False

Question 3

Write the charge balance equation for a dilute aqueous solution of HI.

Accepted Answer

A) [I-] = [OH-] + [H3O+] 
B) [H3O+] = [OH-] 
C) [H3O+] = [I-] 
D) [H3O+] = [I-] + [OH-] 
E) [HI]initial = [I-] 
A) [I-] = [OH-] + [H3O+] 
B) [H3O+] = [OH-] 
C) [H3O+] = [I-] 
D) [H3O+] = [I-] + [OH-] 
E) [HI]initial = [I-]

Question 4

If pKa1 and pKa2 for H2S are 6.88 and 14.15,respectively,calculate the equilibrium constant for the reaction below: H2S(aq)+ 2H2O(l)↔ 2H3O+(aq)+ S2-(aq)

Accepted Answer

A) 1.3 * 10-7  
B) 1.1 * 10-7  
C) 7.7 * 10*8  
D) 9.2 *10-22  
E) 7.1 * 10-15  
A) 1.3 * 10-7  
B) 1.1 * 10-7  
C) 7.7 * 10*8  
D) 9.2 *10-22  
E) 7.1 * 10-15

Question 5

Which of the following does not have an amphoteric oxide?

Accepted Answer

A) PbO 
B) BeO 
C) SnO 
D) Al2O3 
E) All have amphoteric oxides. 
A) PbO 
B) BeO 
C) SnO 
D) Al2O3 
E) All have amphoteric oxides.

Question 6

The pH of 0.800 M aqueous benzenesulfonic acid is 0.51.What is the value of Ka for benzenesulfonic acid?

Accepted Answer

A) 0.19 
B) 0.12 
C) 0.90 
D) 0.44 
E) 0.51 
A) 0.19 
B) 0.12 
C) 0.90 
D) 0.44 
E) 0.51

Question 7

Which of the following acids has the highest pKa?

Accepted Answer

A) HClO 
B) HClO3  
C) HClO4 
D) HBrO 
E) HIO 
A) HClO 
B) HClO3  
C) HClO4 
D) HBrO 
E) HIO

Question 8

Which of the following is the weakest acid?

Accepted Answer

A) HNO3  
B) HBr 
C) HCl 
D) HF 
E) HI 
A) HNO3  
B) HBr 
C) HCl 
D) HF 
E) HI

Question 9

For a solution of phosphoric acid,write the equation for $\alpha$(HPO42-).

Accepted Answer

A) Ka3/([H3O+]3 + Ka1[H3O+]2 + Ka1Ka2[H3O+] + Ka1Ka2Ka3) 
B) [H3O+]/([H3O+]3 + Ka1[H3O+]2 + Ka1Ka2[H3O+] + Ka1Ka2Ka3) 
C) Ka1Ka2[H3O+]/([H3O+]3 + Ka1[H3O+]2 + Ka1Ka2[H3O+] + Ka1Ka2Ka3) 
D) Ka1Ka2Ka3/([H3O+]3 + Ka1[H3O+]2 + Ka1Ka2[H3O+] + Ka1Ka2Ka3) 
E) Ka1[H3O+]2/([H3O+]3 + Ka1[H3O+]2 + Ka1Ka2[H3O+] + Ka1Ka2Ka3) 
A) Ka3/([H3O+]3 + Ka1[H3O+]2 + Ka1Ka2[H3O+] + Ka1Ka2Ka3) 
B) [H3O+]/([H3O+]3 + Ka1[H3O+]2 + Ka1Ka2[H3O+] + Ka1Ka2Ka3) 
C) Ka1Ka2[H3O+]/([H3O+]3 + Ka1[H3O+]2 + Ka1Ka2[H3O+] + Ka1Ka2Ka3) 
D) Ka1Ka2Ka3/([H3O+]3 + Ka1[H3O+]2 + Ka1Ka2[H3O+] + Ka1Ka2Ka3) 
E) Ka1[H3O+]2/([H3O+]3 + Ka1[H3O+]2 + Ka1Ka2[H3O+] + Ka1Ka2Ka3)

Question 10

Which of the following produces the strongest conjugate base?

Accepted Answer

A) HF (pKa = 3.45) 
B) HClO (pKa = 7.53) 
C) HCOOH (pKa = 3.75) 
D) CH3COOH (pKa = 4.75) 
E) HIO (pKa = 10.64) 
A) HF (pKa = 3.45) 
B) HClO (pKa = 7.53) 
C) HCOOH (pKa = 3.75) 
D) CH3COOH (pKa = 4.75) 
E) HIO (pKa = 10.64)

Question 11

What is the conjugate acid of O2-?

Accepted Answer

The answer of What is the conjugate acid of O2-?...

Question 12

For the following acids,which has the highest pKa?

Accepted Answer

A) HIO 
B) HClO3  
C) HClO 
D) HBrO 
E) HClO4  
A) HIO 
B) HClO3  
C) HClO 
D) HBrO 
E) HClO4

Question 13

Write the charge balance equation for a dilute aqueous solution of KOH.

Accepted Answer

A) [KOH]initial = [K+] 
B) [OH-] = [H3O+] + [K+] 
C) [H3O+] = [OH-] 
D) [K+] = [OH-] + [H3O+] 
E) [OH-] = [K+] 
A) [KOH]initial = [K+] 
B) [OH-] = [H3O+] + [K+] 
C) [H3O+] = [OH-] 
D) [K+] = [OH-] + [H3O+] 
E) [OH-] = [K+]

Question 14

Which of the following 0.10 M aqueous solutions gives the lowest pH?

Accepted Answer

A) CCl3COOH (pKa = 0.52) 
B) Because all are acids,the pH is the same for all solutions. 
C) HF (pKa = 3.45) 
D) CH3COOH (pKa = 4.75) 
E) H3PO4 (pKa1 = 2.12) 
A) CCl3COOH (pKa = 0.52) 
B) Because all are acids,the pH is the same for all solutions. 
C) HF (pKa = 3.45) 
D) CH3COOH (pKa = 4.75) 
E) H3PO4 (pKa1 = 2.12)

Question 15

For a 0.10 M solution of a weak acid,HA,with pKa = 10,which of the following is true?

Accepted Answer

A) [HA] $\cong$ 0 
B) [HA] = [A-] 
C) [HA] = [H3O+] 
D) [HA] = Ka  
E) [HA] $\neq$[H3O+] 
A) [HA] $\cong$ 0 
B) [HA] = [A-] 
C) [HA] = [H3O+] 
D) [HA] = Ka  
E) [HA] $\neq$[H3O+]

Question 16

A flask of 0.25 M HBrO(aq)has what pH? (pKa = 8.69)

Accepted Answer

A) 5.90 
B) 0.60 
C) 8.10 
D) 4.65 
E) 9.30 
A) 5.90 
B) 0.60 
C) 8.10 
D) 4.65 
E) 9.30

Question 17

What is the pH of 0.025 M (CH3)3N(aq)(Kb = 6.5 * 10-5)?

Accepted Answer

A) 11.91 
B) 12.40 
C) 11.11 
D) 8.29 
E) 9.81 
A) 11.91 
B) 12.40 
C) 11.11 
D) 8.29 
E) 9.81

Question 18

HBrO(aq),in a 0.25 M solution,has a pKa = 8.69.What is its pH?

Accepted Answer

A) 0.60 
B) 4.65 
C) 5.90 
D) 8.10 
E) 9.30 
A) 0.60 
B) 4.65 
C) 5.90 
D) 8.10 
E) 9.30

Question 19

All of the following are strong bases in water except

Accepted Answer

A) NaHCO3 
B) CaO 
C) Na2O 
D) Na2SO4 
A) NaHCO3 
B) CaO 
C) Na2O 
D) Na2SO4

Question 20

For a solution labeled "0.10 M H2SO3(aq)," pKa1 = 1.81 and pKa2 = 6.91,which of the following is true?

Accepted Answer

A) [H+] = 0.2 M. 
B) The pH is 1.0. 
C) The pH ~1.5. 
D) The pH is 0.70. 
E) The pH ~ 4.4. 
A) [H+] = 0.2 M. 
B) The pH is 1.0. 
C) The pH ~1.5. 
D) The pH is 0.70. 
E) The pH ~ 4.4.

The amino acid alanine,HOOC-CH(CH₃)NH₃⁺,has K_a1 = 4.5 * 10^-3 and K_a2 = 1.4 * 10^-10.Calculate $\alpha$ (^-OOC-CH(CH₃)NH₃⁺)at pH 10.

In liquid ammonia,the base B is a strong base if it is a stronger proton acceptor than NH₂^-.

Write the charge balance equation for a dilute aqueous solution of HI.

If pK_a1 and pK_a2 for H₂S are 6.88 and 14.15,respectively,calculate the equilibrium constant for the reaction below: H₂S(aq)+ 2H₂O(l)↔ 2H₃O⁺(aq)+ S^2-(aq)

Which of the following does not have an amphoteric oxide?

The pH of 0.800 M aqueous benzenesulfonic acid is 0.51.What is the value of K_a for benzenesulfonic acid?

Which of the following acids has the highest pK_a?

Which of the following is the weakest acid?

For a solution of phosphoric acid,write the equation for $\alpha$ (HPO₄²^-).

Which of the following produces the strongest conjugate base?

What is the conjugate acid of O^2-?

For the following acids,which has the highest pK_a?

Write the charge balance equation for a dilute aqueous solution of KOH.

Which of the following 0.10 M aqueous solutions gives the lowest pH?

For a 0.10 M solution of a weak acid,HA,with pK_a = 10,which of the following is true?

A flask of 0.25 M HBrO(aq)has what pH? (pK_a = 8.69)

What is the pH of 0.025 M (CH₃)₃N(aq)(K_b = 6.5 * 10^-5)?

HBrO(aq),in a 0.25 M solution,has a pK_a = 8.69.What is its pH?

All of the following are strong bases in water except

For a solution labeled "0.10 M H₂SO₃(aq)," pK_a1 = 1.81 and pK_a2 = 6.91,which of the following is true?

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Exam 12: Acids and Bases

The amino acid alanine,HOOC-CH(CH3)NH3+,has Ka1 = 4.5 * 10-3 and Ka2 = 1.4 * 10-10.Calculate α\alphaα (-OOC-CH(CH3)NH3+)at pH 10.

In liquid ammonia,the base B is a strong base if it is a stronger proton acceptor than NH2-.

Write the charge balance equation for a dilute aqueous solution of HI.

If pKa1 and pKa2 for H2S are 6.88 and 14.15,respectively,calculate the equilibrium constant for the reaction below: H2S(aq)+ 2H2O(l)↔ 2H3O+(aq)+ S2-(aq)

Which of the following does not have an amphoteric oxide?

The pH of 0.800 M aqueous benzenesulfonic acid is 0.51.What is the value of Ka for benzenesulfonic acid?

Which of the following acids has the highest pKa?

Which of the following is the weakest acid?

For a solution of phosphoric acid,write the equation for α\alphaα (HPO42-).

Which of the following produces the strongest conjugate base?

What is the conjugate acid of O2-?

For the following acids,which has the highest pKa?

Write the charge balance equation for a dilute aqueous solution of KOH.

Which of the following 0.10 M aqueous solutions gives the lowest pH?

For a 0.10 M solution of a weak acid,HA,with pKa = 10,which of the following is true?

A flask of 0.25 M HBrO(aq)has what pH? (pKa = 8.69)

What is the pH of 0.025 M (CH3)3N(aq)(Kb = 6.5 * 10-5)?

HBrO(aq),in a 0.25 M solution,has a pKa = 8.69.What is its pH?

All of the following are strong bases in water except

For a solution labeled "0.10 M H2SO3(aq)," pKa1 = 1.81 and pKa2 = 6.91,which of the following is true?

The Quantum World

Quantum Mechanics in Action: Atoms

Chemical Bonds

Molecular Shape and Structure

The Properties of Gases

Liquids and Solids

Inorganic Materials

Thermodynamics: The First Law

Thermodynamics: The Second and Third Laws

Physical Equilibria

Chemical Equilibria

Aqueous Equilibria

Electrochemistry

Chemical Kinetics

The Elements: the Main Group Elements

The Elements: The D Block

Nuclear Chemistry

Organic Chemistry I

Organic Chemistry II

Filters

The amino acid alanine,HOOC-CH(CH₃)NH₃⁺,has K_a1 = 4.5 * 10^-3 and K_a2 = 1.4 * 10^-10.Calculate $\alpha$ (^-OOC-CH(CH₃)NH₃⁺)at pH 10.

In liquid ammonia,the base B is a strong base if it is a stronger proton acceptor than NH₂^-.

If pK_a1 and pK_a2 for H₂S are 6.88 and 14.15,respectively,calculate the equilibrium constant for the reaction below: H₂S(aq)+ 2H₂O(l)↔ 2H₃O⁺(aq)+ S^2-(aq)

The pH of 0.800 M aqueous benzenesulfonic acid is 0.51.What is the value of K_a for benzenesulfonic acid?

Which of the following acids has the highest pK_a?

For a solution of phosphoric acid,write the equation for $\alpha$ (HPO₄²^-).

What is the conjugate acid of O^2-?

For the following acids,which has the highest pK_a?

For a 0.10 M solution of a weak acid,HA,with pK_a = 10,which of the following is true?

A flask of 0.25 M HBrO(aq)has what pH? (pK_a = 8.69)

What is the pH of 0.025 M (CH₃)₃N(aq)(K_b = 6.5 * 10^-5)?

HBrO(aq),in a 0.25 M solution,has a pK_a = 8.69.What is its pH?

For a solution labeled "0.10 M H₂SO₃(aq)," pK_a1 = 1.81 and pK_a2 = 6.91,which of the following is true?