Question 1

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

Accepted Answer

A)  H3O+(aq) + Cl-(aq) + Na+(aq) + OH-(aq) → Na+(aq) + Cl-(aq) + 2H2O(l) 
B)  HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l) 
C)  H3O+(aq) + OH-(aq) → 2H2O(l) 
D)  none of these 
A)  H3O+(aq) + Cl-(aq) + Na+(aq) + OH-(aq) → Na+(aq) + Cl-(aq) + 2H2O(l) 
B)  HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l) 
C)  H3O+(aq) + OH-(aq) → 2H2O(l) 
D)  none of these

Question 2

Which of the following is the conjugate base of HPO42-?

Accepted Answer

A)  H3PO4 
B)  H2PO4- 
C)  PO43- 
D)  OH- 
A)  H3PO4 
B)  H2PO4- 
C)  PO43- 
D)  OH-

Question 3

The end point of an acid-base titration corresponds to which of the following?

Accepted Answer

A)  The point where equal volumes of acid and base have been used. 
B)  The point where the acid and base have been added in proper stoichiometric amounts. 
C)  The point where a pH indicator changes color. 
D)  none of the above 
A)  The point where equal volumes of acid and base have been used. 
B)  The point where the acid and base have been added in proper stoichiometric amounts. 
C)  The point where a pH indicator changes color. 
D)  none of the above

Question 4

Which of the following is a triprotic acid?

Accepted Answer

A)  HCl 
B)  HNO3 
C)  H2SO4 
D)  H3PO4 
A)  HCl 
B)  HNO3 
C)  H2SO4 
D)  H3PO4

Question 5

According to Arrhenius which species is associated with all acids?

Accepted Answer

A)  H3O+ 
B)  OH- 
C)  H2O 
D)  none of these 
A)  H3O+ 
B)  OH- 
C)  H2O 
D)  none of these

Question 6

Which of the following is formed when a strong acid reacts with dimethylamine, (CH3)2NH?

Accepted Answer

A)  CH3NH3 
B)  CH3NH3+ 
C)  (CH3)2NH2+ 
D)  None of these, no reaction occurs. 
A)  CH3NH3 
B)  CH3NH3+ 
C)  (CH3)2NH2+ 
D)  None of these, no reaction occurs.

Question 7

When carrying out a titration which of the following situations is most desirable?

Accepted Answer

A)  The equivalence point is reached before the end point. 
B)  The equivalence point corresponds to the end point. 
C)  The equivalence point is reached after the end point. 
D)  All of the above are equally acceptable. 
A)  The equivalence point is reached before the end point. 
B)  The equivalence point corresponds to the end point. 
C)  The equivalence point is reached after the end point. 
D)  All of the above are equally acceptable.

Question 8

When comparing the strength of two weak acids which factor do we use to determine which is the stronger of the two?

Accepted Answer

A)  the formula weights of the acids 
B)  the number of protons the acids can lose 
C)  the values of the pKa's of the acids 
D)  none of the above 
A)  the formula weights of the acids 
B)  the number of protons the acids can lose 
C)  the values of the pKa's of the acids 
D)  none of the above

Question 9

Examine the activity series given below.  
-Which of the following elements would be the least likely to release hydrogen gas (H2) upon reaction with water or acid?

Accepted Answer

A)  Ag 
B)  Ni 
C)  Al 
D)  Mg 
A)  Ag 
B)  Ni 
C)  Al 
D)  Mg

Question 10

Buffers which do not readily permeate cell membranes often involve which of the following?

Accepted Answer

A)  only anions 
B)  only cations 
C)  only neutral molecules 
D)  zwitterions 
A)  only anions 
B)  only cations 
C)  only neutral molecules 
D)  zwitterions

Question 11

Which base is sometimes used as a laxative?

Accepted Answer

A)  LiOH 
B)  Mg(OH)2 
C)  NaOH 
D)  NH3 
A)  LiOH 
B)  Mg(OH)2 
C)  NaOH 
D)  NH3

Question 12

Which of the following can be characterized as a strong base?

Accepted Answer

A)  0.001 M KOH 
B)  3.0 M NH3 
C)  both a and b 
D)  neither a nor b 
A)  0.001 M KOH 
B)  3.0 M NH3 
C)  both a and b 
D)  neither a nor b

Question 13

In an aqueous solution the [H3O+] is 2.0 x 10 -6 M. What is the [OH-]?

Accepted Answer

A)  5.0 × 10-9 M 
B)  1.0 × 10-7 M 
C)  2.0 × 10- 6 M 
D)  1.0 × 108 M 
A)  5.0 × 10-9 M 
B)  1.0 × 10-7 M 
C)  2.0 × 10- 6 M 
D)  1.0 × 108 M

Question 14

Which of the following is the net ionic equation for the reaction of the weak acid HC2H3O2 with the weak base NH3?

Accepted Answer

A)  HC2H3O2(aq) + NH3(aq) → NH4C2H3O2(aq) 
B)  HC2H3O2(aq) + NH3(aq) → C2H3O2-(aq) + NH4+(aq) 
C)  H3O+(aq) + NH3(aq) → NH4OH(aq) 
D)  H3O+(aq) + C2H3O2-(aq) + NH3(aq) → NH4+(aq) + C2H3O2-(aq) + H2O(l) 
A)  HC2H3O2(aq) + NH3(aq) → NH4C2H3O2(aq) 
B)  HC2H3O2(aq) + NH3(aq) → C2H3O2-(aq) + NH4+(aq) 
C)  H3O+(aq) + NH3(aq) → NH4OH(aq) 
D)  H3O+(aq) + C2H3O2-(aq) + NH3(aq) → NH4+(aq) + C2H3O2-(aq) + H2O(l)

Question 15

Which of the following species has the largest concentration in buffering systems of human blood?

Accepted Answer

A)  H2CO3 
B)  HCO3- 
C)  H2PO4- 
D)  HPO42- 
A)  H2CO3 
B)  HCO3- 
C)  H2PO4- 
D)  HPO42-

Question 16

Which of the following is the conjugate base of H2PO4-?

Accepted Answer

A)  H3PO4 
B)  HPO42- 
C)  PO43- 
D)  OH- 
A)  H3PO4 
B)  HPO42- 
C)  PO43- 
D)  OH-

Question 17

When NH3 is dissolved in water which of the following is true of the equilibrium which is established as represented below? NH3(aq) + H2O(l)   NH4+(aq) + OH-(aq)

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 18

Which of the following buffers will have the lowest pH?

Accepted Answer

A)  a solution containing 0.20 M HC2H3O2 and 0.20 M NaC2H3O2 
B)  a solution containing 0.25 M HC2H3O2 and 0.15 M NaC2H3O2 
C)  a solution containing 0.15 M HC2H3O2 and 0.25 M NaC2H3O2 
D)  They all have the same pH. 
A)  a solution containing 0.20 M HC2H3O2 and 0.20 M NaC2H3O2 
B)  a solution containing 0.25 M HC2H3O2 and 0.15 M NaC2H3O2 
C)  a solution containing 0.15 M HC2H3O2 and 0.25 M NaC2H3O2 
D)  They all have the same pH.

Question 19

Hydrocyanic acid, HCN, is a weak acid. Which of the following is the correct expression for the Ka of hydrocyanic acid?

Accepted Answer

A)  [H3O+][HCN]/[CN-] 
B)  [H3O+][CN-]/[HCN] 
C)  [HCN]/[ H3O+][CN-] 
D)  [HCN][CN-]/[ H3O+] 
A)  [H3O+][HCN]/[CN-] 
B)  [H3O+][CN-]/[HCN] 
C)  [HCN]/[ H3O+][CN-] 
D)  [HCN][CN-]/[ H3O+]

Question 20

What are the two acids in the following reaction? NH4+(aq) + HPO42-   NH3 + H2PO4-

Accepted Answer

A)  NH4+ and HPO42- 
B)  NH4+ and NH3 
C)  HPO42- and H2PO4- 
D)  NH4+ and H2PO4- 
A)  NH4+ and HPO42- 
B)  NH4+ and NH3 
C)  HPO42- and H2PO4- 
D)  NH4+ and H2PO4-

Exam 8: Acids and Bases

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

Which of the following is the conjugate base of HPO42-?

The end point of an acid-base titration corresponds to which of the following?

Which of the following is a triprotic acid?

According to Arrhenius which species is associated with all acids?

Which of the following is formed when a strong acid reacts with dimethylamine, (CH3)2NH?

When carrying out a titration which of the following situations is most desirable?

When comparing the strength of two weak acids which factor do we use to determine which is the stronger of the two?

Examine the activity series given below. -Which of the following elements would be the least likely to release hydrogen gas (H2) upon reaction with water or acid?

Buffers which do not readily permeate cell membranes often involve which of the following?

Which base is sometimes used as a laxative?

Which of the following can be characterized as a strong base?

In an aqueous solution the [H3O+] is 2.0 x 10 -6 M. What is the [OH-]?

Which of the following is the net ionic equation for the reaction of the weak acid HC2H3O2 with the weak base NH3?

Which of the following species has the largest concentration in buffering systems of human blood?

Which of the following is the conjugate base of H2PO4-?

When NH3 is dissolved in water which of the following is true of the equilibrium which is established as represented below? NH3(aq) + H2O(l) NH4+(aq) + OH-(aq)

Which of the following buffers will have the lowest pH?

Hydrocyanic acid, HCN, is a weak acid. Which of the following is the correct expression for the Ka of hydrocyanic acid?

What are the two acids in the following reaction? NH4+(aq) + HPO42- NH3 + H2PO4-

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Which of the following is the conjugate base of HPO₄^2-?

Which of the following is formed when a strong acid reacts with dimethylamine, (CH₃)₂NH?

Examine the activity series given below. -Which of the following elements would be the least likely to release hydrogen gas (H₂) upon reaction with water or acid?

In an aqueous solution the [H₃O⁺] is 2.0 x 10 ^-6 M. What is the [OH-]?

Which of the following is the net ionic equation for the reaction of the weak acid HC₂H₃O₂ with the weak base NH₃?

Which of the following is the conjugate base of H₂PO₄^-?

When NH₃ is dissolved in water which of the following is true of the equilibrium which is established as represented below? NH₃(aq) + H₂O(l) NH₄⁺(aq) + OH^-(aq)

Hydrocyanic acid, HCN, is a weak acid. Which of the following is the correct expression for the K_a of hydrocyanic acid?

What are the two acids in the following reaction? NH₄⁺(aq) + HPO₄^2- NH₃ + H₂PO₄^-