Question 1

Which of the following is true of all titrations?

Accepted Answer

A)  They are acid base reactions. 
B)  The chemicals react in a 1:1 ratio. 
C)  The reaction must occur rapidly and completely. 
D)  all of the above 
A)  They are acid base reactions. 
B)  The chemicals react in a 1:1 ratio. 
C)  The reaction must occur rapidly and completely. 
D)  all of the above

Question 2

Why is it advantageous to a sprinter to induce alkalosis just before a race?

Accepted Answer

A)  It increases the respiratory rate. 
B)  It strengthens the leg muscles. 
C)  The sprinter can neutralize more lactic acid. 
D)  none of the above 
A)  It increases the respiratory rate. 
B)  It strengthens the leg muscles. 
C)  The sprinter can neutralize more lactic acid. 
D)  none of the above

Question 3

Which of the following must we know when we carry out a titration?

Accepted Answer

A)  the concentration of all the reactants 
B)  the stoichiometric ratio of the reactants 
C)  both a and b 
D)  neither a nor b 
A)  the concentration of all the reactants 
B)  the stoichiometric ratio of the reactants 
C)  both a and b 
D)  neither a nor b

Question 4

Which of the following acids has the weakest conjugate base?

Accepted Answer

A)  CH3COOH 
B)  C6H5OH 
C)  H2SO4 
D)  H3PO4 
A)  CH3COOH 
B)  C6H5OH 
C)  H2SO4 
D)  H3PO4

Question 5

Hydrocyanic acid, HCN, is a weaker acid than ammonium ion, NH4+. When hydrocyanic acid reacts with ammonia, NH3, what species are present in the solution in the largest amount?

Accepted Answer

A)  hydrocyanic acid, HCN, and ammonia, NH3 
B)  hydrocyanic acid, HCN, and ammonium ion, NH4+ 
C)  cyanide ion, CN-, and ammonia, NH3 
D)  cyanide ion, CN-, and ammonium ion, NH4+ 
A)  hydrocyanic acid, HCN, and ammonia, NH3 
B)  hydrocyanic acid, HCN, and ammonium ion, NH4+ 
C)  cyanide ion, CN-, and ammonia, NH3 
D)  cyanide ion, CN-, and ammonium ion, NH4+

Question 6

A solution has a pH of 5.4. What is its pOH?

Accepted Answer

A)  -8.6 
B)  -5.4 
C)  5.4 
D)  8.6 
A)  -8.6 
B)  -5.4 
C)  5.4 
D)  8.6

Question 7

Consider the following hypothetical acid-base reaction. A(aq) + B(aq)   C(aq) + D(aq)
Weaker acid weaker base stronger acid stronger base

Accepted Answer

A)  The position of the equilibrium favors the forward reaction. 
B)  The position of the equilibrium favors the reverse reaction. 
C)  Neither the forward nor the reverse reaction are favored at equilibrium. 
D)  The position of equilibrium cannot be predicted from the given data. 
A)  The position of the equilibrium favors the forward reaction. 
B)  The position of the equilibrium favors the reverse reaction. 
C)  Neither the forward nor the reverse reaction are favored at equilibrium. 
D)  The position of equilibrium cannot be predicted from the given data.

Question 8

When HCl is dissolved in water which of the following is true of the equilibrium which is established?

Accepted Answer

A)  It lies virtually completely to the left. 
B)  It lies slightly to the left. 
C)  It lies virtually completely to the right. 
D)  It lies slightly to the right. 
A)  It lies virtually completely to the left. 
B)  It lies slightly to the left. 
C)  It lies virtually completely to the right. 
D)  It lies slightly to the right.

Question 9

The pKa of acetic acid, HC2H3O2, is 4.75. What is the pH of a buffer in which [HC2H3O2] = 2.0 M and [NaC2H3O2] = 0.20 M?

Accepted Answer

A)  3.75 
B)  4.75 
C)  5.75 
D)  7.00 
A)  3.75 
B)  4.75 
C)  5.75 
D)  7.00

Question 10

Increasing which of the following will decrease the buffer capacity of a buffer made using acetic acid and sodium acetate?

Accepted Answer

A)  the amount of water present 
B)  the [C2H3O2-] 
C)  the [HC2H3O2] 
D)  the ratio [C2H3O2-]/[HC2H3O2] 
A)  the amount of water present 
B)  the [C2H3O2-] 
C)  the [HC2H3O2] 
D)  the ratio [C2H3O2-]/[HC2H3O2]

Question 11

A sodium hydroxide solution has a pH of 11.40, what is the [OH-] in this solution?

Accepted Answer

A)  4.0 × 10-26 M 
B)  4.0 × 10-12 M 
C)  2.5 × 10-3 M 
D)  2.5 × 1011 M 
A)  4.0 × 10-26 M 
B)  4.0 × 10-12 M 
C)  2.5 × 10-3 M 
D)  2.5 × 1011 M

Question 12

Which of the following is the net ionic equation for the reaction of the strong acid HCl with the weak base NH3?

Accepted Answer

A)  H3O+(aq) + Cl-(aq) + NH3(aq) → NH4+(aq) + Cl-(aq) + H2O(l) 
B)  H3O+(aq) + NH3(aq) → NH4+(aq) + H2O(l) 
C)  HCl(aq) + NH3(aq) → NH4Cl(aq) 
D)  none of these 
A)  H3O+(aq) + Cl-(aq) + NH3(aq) → NH4+(aq) + Cl-(aq) + H2O(l) 
B)  H3O+(aq) + NH3(aq) → NH4+(aq) + H2O(l) 
C)  HCl(aq) + NH3(aq) → NH4Cl(aq) 
D)  none of these

Question 13

Cyanide ion, CN-, is a stronger base than ammonia, NH3. When ammonia reacts with hydrocyanic acid, HCN, what species are present in the solution in the largest amount?

Accepted Answer

A)  hydrocyanic acid, HCN, and ammonia, NH3 
B)  hydrocyanic acid, HCN, and ammonium ion, NH4+ 
C)  cyanide ion, CN-, and ammonia, NH3 
D)  cyanide ion, CN-, and ammonium ion, NH4+ 
A)  hydrocyanic acid, HCN, and ammonia, NH3 
B)  hydrocyanic acid, HCN, and ammonium ion, NH4+ 
C)  cyanide ion, CN-, and ammonia, NH3 
D)  cyanide ion, CN-, and ammonium ion, NH4+

Question 14

Which of the following is the net ionic equation for the reaction of the weak acid HC2H3O2 with the strong base NaOH?

Accepted Answer

A)  HC2H3O2(aq) + NaOH(aq) → NaC2H3O2(aq) + H2O(l) 
B)  H3O+(aq) + OH-(aq) → H2O(l) 
C)  HC2H3O2(aq) + OH-(aq) → C2H3O2-(aq) + H2O(l) 
D)  H3O+(aq) + C2H3O2-(aq) + Na+(aq) + OH-(aq) →
Na+(aq) + C2H3O2-(aq) + 2 H2O(l) 
A)  HC2H3O2(aq) + NaOH(aq) → NaC2H3O2(aq) + H2O(l) 
B)  H3O+(aq) + OH-(aq) → H2O(l) 
C)  HC2H3O2(aq) + OH-(aq) → C2H3O2-(aq) + H2O(l) 
D)  H3O+(aq) + C2H3O2-(aq) + Na+(aq) + OH-(aq) →
Na+(aq) + C2H3O2-(aq) + 2 H2O(l)

Question 15

Examine the activity series given below.  
-Based on the activity series shown, what are the products of the following reaction? Cu(s) + 2H+(aq) →

Accepted Answer

A)  Cu2+ 
B)  H2 
C)  H3O+ 
D)  both a and b 
E)  No reaction occurs in this case. 
A)  Cu2+ 
B)  H2 
C)  H3O+ 
D)  both a and b 
E)  No reaction occurs in this case.

Question 16

The species H3O+ can be called which of the following?

Accepted Answer

A)  heavy water 
B)  hydrogen ion 
C)  hydronium ion 
D)  all of these 
A)  heavy water 
B)  hydrogen ion 
C)  hydronium ion 
D)  all of these

Question 17

Which of the following is not an acid?

Accepted Answer

A)  H3O+ 
B)  H2CO3 
C)  HPO42- 
D)  None, they are all acids. 
A)  H3O+ 
B)  H2CO3 
C)  HPO42- 
D)  None, they are all acids.

Exam 8: Acids and Bases

Which of the following is true of all titrations?

Why is it advantageous to a sprinter to induce alkalosis just before a race?

Which of the following must we know when we carry out a titration?

Which of the following acids has the weakest conjugate base?

Hydrocyanic acid, HCN, is a weaker acid than ammonium ion, NH4+. When hydrocyanic acid reacts with ammonia, NH3, what species are present in the solution in the largest amount?

A solution has a pH of 5.4. What is its pOH?

Consider the following hypothetical acid-base reaction. A(aq) + B(aq) C(aq) + D(aq) Weaker acid weaker base stronger acid stronger base

When HCl is dissolved in water which of the following is true of the equilibrium which is established?

The pKa of acetic acid, HC2H3O2, is 4.75. What is the pH of a buffer in which [HC2H3O2] = 2.0 M and [NaC2H3O2] = 0.20 M?

Increasing which of the following will decrease the buffer capacity of a buffer made using acetic acid and sodium acetate?

A sodium hydroxide solution has a pH of 11.40, what is the [OH-] in this solution?

Which of the following is the net ionic equation for the reaction of the strong acid HCl with the weak base NH3?

Cyanide ion, CN-, is a stronger base than ammonia, NH3. When ammonia reacts with hydrocyanic acid, HCN, what species are present in the solution in the largest amount?

Which of the following is the net ionic equation for the reaction of the weak acid HC2H3O2 with the strong base NaOH?

Examine the activity series given below. -Based on the activity series shown, what are the products of the following reaction? Cu(s) + 2H+(aq) →

The species H3O+ can be called which of the following?

Which of the following is not an acid?

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Hydrocyanic acid, HCN, is a weaker acid than ammonium ion, NH₄⁺. When hydrocyanic acid reacts with ammonia, NH₃, what species are present in the solution in the largest amount?

The pK_a of acetic acid, HC₂H₃O₂, is 4.75. What is the pH of a buffer in which [HC₂H₃O₂] = 2.0 M and [NaC₂H₃O₂] = 0.20 M?

A sodium hydroxide solution has a pH of 11.40, what is the [OH^-] in this solution?

Which of the following is the net ionic equation for the reaction of the strong acid HCl with the weak base NH₃?

Cyanide ion, CN-, is a stronger base than ammonia, NH₃. When ammonia reacts with hydrocyanic acid, HCN, what species are present in the solution in the largest amount?

Which of the following is the net ionic equation for the reaction of the weak acid HC₂H₃O₂ with the strong base NaOH?

Examine the activity series given below. -Based on the activity series shown, what are the products of the following reaction? Cu(s) + 2H⁺(aq) →

The species H₃O⁺ can be called which of the following?