Question 1

Calcium oxide,CaO,also known as quick lime,may react with carbon dioxide to form calcium carbonate,CaCO3.Which acts as a Lewis acid in the reaction?

Accepted Answer

A) Ca2+ 
B) O2- 
C) CO2 
D) CaCO3 
E) CO32- 
A) Ca2+ 
B) O2- 
C) CO2 
D) CaCO3 
E) CO32-

Question 2

Find the pH of a 0.135 M aqueous solution of periodic acid (HIO4),for which Ka = 2.3 × 10-2.

Accepted Answer

A) 1.25 
B) 3.28 
C) 1.17 
D) 1.34 
E) 1.64 
A) 1.25 
B) 3.28 
C) 1.17 
D) 1.34 
E) 1.64

Question 3

The stronger the acid,the weaker its conjugate base.

Accepted Answer

A) True 
 B)False

Question 4

What mass of sodium nitrite must be added to enough water to make 350.0 mL of a solution with pH = 8.40? [Ka(HNO2)= 5.6 × 10-4]

Accepted Answer

A) 68 g 
B) 1.7 × 10-4 g 
C) 0.039 g 
D) 8.7 g 
E) 24 g 
A) 68 g 
B) 1.7 × 10-4 g 
C) 0.039 g 
D) 8.7 g 
E) 24 g

Question 5

Which of the following salts will form an acidic solution when dissolved in water?

Accepted Answer

A) NaCl 
B) NaNO2 
C) NH4NO3 
D) NH4CN 
A) NaCl 
B) NaNO2 
C) NH4NO3 
D) NH4CN

Question 6

What is the pH of a 0.20 M solution of NH4Cl? [Kb(NH3)= 1.8 × 10-5]

Accepted Answer

A) 3.74 
B) 4.98 
C) 6.53 
D) 9.02 
E) 11.28 
A) 3.74 
B) 4.98 
C) 6.53 
D) 9.02 
E) 11.28

Question 7

What is the name given to a substance that can act as a Brønsted acid or as a Brønsted base according to what it is reacting with?

Accepted Answer

A) hydrophilic 
B) hydrophobic 
C) amphoteric 
D) isoprotic 
E) isoelectronic 
A) hydrophilic 
B) hydrophobic 
C) amphoteric 
D) isoprotic 
E) isoelectronic

Question 8

What is the value of Kb for the cyanide anion,CN-? Ka(HCN)= 6.2 × 10-10

Accepted Answer

A) 1.6 × 10-4 
B) 1.6 × 10-5 
C) 3.8 × 10-4 
D) 3.8 × 10-5 
E) 6.2 × 104 
A) 1.6 × 10-4 
B) 1.6 × 10-5 
C) 3.8 × 10-4 
D) 3.8 × 10-5 
E) 6.2 × 104

Question 9

Which is the strongest acid?

Accepted Answer

A) SO42- 
B) H2SO3 
C) H2SO4 
D) HSO4- 
E) HSO3- 
A) SO42- 
B) H2SO3 
C) H2SO4 
D) HSO4- 
E) HSO3-

Question 10

Which statement is true regarding the reversible reaction below? H2CO3+ F-   HCO3+ HF.Ka1(H2CO3)= 4.2 × 10-7; Ka(HF)= 7.1 × 10-4

Accepted Answer

A) At equilibrium,[HF] > [H2CO3] because HF is a stronger acid than H2CO3. 
B) At equilibrium,[HF] > [H2CO3] because H2CO3 is a stronger acid than HF. 
C) At equilibrium,[HF] = [H2CO3]. 
D) At equilibrium,[H2CO3] > [HF] because HF is a stronger acid than H2CO3. 
E) At equilibrium,[H2CO3] > [HF] because H2CO3 is a stronger acid than HF. 
A) At equilibrium,[HF] > [H2CO3] because HF is a stronger acid than H2CO3. 
B) At equilibrium,[HF] > [H2CO3] because H2CO3 is a stronger acid than HF. 
C) At equilibrium,[HF] = [H2CO3]. 
D) At equilibrium,[H2CO3] > [HF] because HF is a stronger acid than H2CO3. 
E) At equilibrium,[H2CO3] > [HF] because H2CO3 is a stronger acid than HF.

Question 11

Iodine trichloride,ICl3,will react with a chloride ion to form ICl4-.Which acts as a Lewis acid this reaction?

Accepted Answer

A) ICl4- 
B) ICl3 
C) Cl- 
D) I3+ 
E) The solvent 
A) ICl4- 
B) ICl3 
C) Cl- 
D) I3+ 
E) The solvent

Question 12

Identify the conjugate base of HPO42- in the reaction HCO3- + HPO42-
    H2CO3 + PO43-

Accepted Answer

A) H2O 
B) HCO3- 
C) H2CO3 
D) PO43- 
E) None of these 
A) H2O 
B) HCO3- 
C) H2CO3 
D) PO43- 
E) None of these

Question 13

Which is the formula for the hydronium ion?

Accepted Answer

A) OH- 
B) H2O 
C) H3O+ 
D) H3O- 
E) H2O + 
A) OH- 
B) H2O 
C) H3O+ 
D) H3O- 
E) H2O +

Question 14

Which is the strongest acid?

Accepted Answer

A) HBrO3 
B) HClO 
C) HBrO2 
D) HBrO 
E) HClO3 
A) HBrO3 
B) HClO 
C) HBrO2 
D) HBrO 
E) HClO3

Question 15

Since arsenic is a nonmetal,As2O3 is expected to be a/an _____ oxide.

Accepted Answer

A) acidic 
B) ionic 
C) amphoteric 
D) neutral 
E) basic 
A) acidic 
B) ionic 
C) amphoteric 
D) neutral 
E) basic

Question 16

In the reaction,HSO4-(aq)+ OH-(aq)   SO42-(aq)+ H2O (l),the conjugate acid-base pairs are pair 1 pair 2

Accepted Answer

A) HSO4- and SO42-; H2O and OH-. 
B) HSO4- and H3O+; SO42 - and OH-. 
C) HSO4- and OH-; SO42 - and H2O. 
D) HSO4- and H2O; OH - and SO42-. 
E) HSO4- and OH-; SO42 - and H3O+. 
A) HSO4- and SO42-; H2O and OH-. 
B) HSO4- and H3O+; SO42 - and OH-. 
C) HSO4- and OH-; SO42 - and H2O. 
D) HSO4- and H2O; OH - and SO42-. 
E) HSO4- and OH-; SO42 - and H3O+.

Question 17

A solution is prepared by adding 0.10 mol of iron(III)nitrate,Fe(NO3)3,to 1.00 L of water.Which statement about the solution is correct?

Accepted Answer

A) The solution is basic. 
B) The solution is neutral. 
C) The solution is acidic. 
D) The value of Ka for the species in solution must be known before a prediction can be made. 
E) The value of Kb for the species in solution must be known before a prediction can be made. 
A) The solution is basic. 
B) The solution is neutral. 
C) The solution is acidic. 
D) The value of Ka for the species in solution must be known before a prediction can be made. 
E) The value of Kb for the species in solution must be known before a prediction can be made.

Question 18

What is the pOH of a 0.0085 M KOH solution?

Accepted Answer

A) 2.07 
B) 4.85 
C) 9.15 
D) 11.93 
E) 0.0085 
A) 2.07 
B) 4.85 
C) 9.15 
D) 11.93 
E) 0.0085

Question 19

A(n)_______________ can be added to a solution to increase the pH of the solution.

Accepted Answer

The answer of A(n)_______________ can be added to a solution...

Question 20

Formic acid,which is a component of some insect venoms,has a Ka = 1.8 × 10-4.What is the [H3O+] in a solution that is initially 0.10 M formic acid,HCOOH?

Accepted Answer

A) 4.2 × 10-3 M 
B) 8.4 × 10-3 M 
C) 1.8 × 10-4 M 
D) 1.8 × 10-5 M 
E) 1.8 × 10-6 M 
A) 4.2 × 10-3 M 
B) 8.4 × 10-3 M 
C) 1.8 × 10-4 M 
D) 1.8 × 10-5 M 
E) 1.8 × 10-6 M

Exam 16: Acids and Bases

Calcium oxide,CaO,also known as quick lime,may react with carbon dioxide to form calcium carbonate,CaCO3.Which acts as a Lewis acid in the reaction?

Find the pH of a 0.135 M aqueous solution of periodic acid (HIO4),for which Ka = 2.3 × 10-2.

The stronger the acid,the weaker its conjugate base.

What mass of sodium nitrite must be added to enough water to make 350.0 mL of a solution with pH = 8.40? [Ka(HNO2)= 5.6 × 10-4]

Which of the following salts will form an acidic solution when dissolved in water?

What is the pH of a 0.20 M solution of NH4Cl? [Kb(NH3)= 1.8 × 10-5]

What is the name given to a substance that can act as a Brønsted acid or as a Brønsted base according to what it is reacting with?

What is the value of Kb for the cyanide anion,CN-? Ka(HCN)= 6.2 × 10-10

Which is the strongest acid?

Which statement is true regarding the reversible reaction below? H2CO3+ F- HCO3+ HF.Ka1(H2CO3)= 4.2 × 10-7; Ka(HF)= 7.1 × 10-4

Iodine trichloride,ICl3,will react with a chloride ion to form ICl4-.Which acts as a Lewis acid this reaction?

Identify the conjugate base of HPO42- in the reaction HCO3- + HPO42- H2CO3 + PO43-

Which is the formula for the hydronium ion?

Which is the strongest acid?

Since arsenic is a nonmetal,As2O3 is expected to be a/an _____ oxide.

In the reaction,HSO4-(aq)+ OH-(aq) SO42-(aq)+ H2O (l),the conjugate acid-base pairs are pair 1 pair 2

A solution is prepared by adding 0.10 mol of iron(III)nitrate,Fe(NO3)3,to 1.00 L of water.Which statement about the solution is correct?

What is the pOH of a 0.0085 M KOH solution?

A(n)_______________ can be added to a solution to increase the pH of the solution.

Formic acid,which is a component of some insect venoms,has a Ka = 1.8 × 10-4.What is the [H3O+] in a solution that is initially 0.10 M formic acid,HCOOH?

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Filters

Calcium oxide,CaO,also known as quick lime,may react with carbon dioxide to form calcium carbonate,CaCO₃.Which acts as a Lewis acid in the reaction?

Find the pH of a 0.135 M aqueous solution of periodic acid (HIO₄),for which K_a = 2.3 × 10^-².

What mass of sodium nitrite must be added to enough water to make 350.0 mL of a solution with pH = 8.40? [K_a(HNO₂)= 5.6 × 10^-⁴]

What is the pH of a 0.20 M solution of NH₄Cl? [K_b(NH₃)= 1.8 × 10^-⁵]

What is the value of K_b for the cyanide anion,CN^-? K_a(HCN)= 6.2 × 10^-¹⁰

Which statement is true regarding the reversible reaction below? H₂CO₃+ F^- HCO₃+ HF.K_a1(H₂CO₃)= 4.2 × 10^-⁷; K_a(HF)= 7.1 × 10^-⁴

Iodine trichloride,ICl₃,will react with a chloride ion to form ICl₄^-.Which acts as a Lewis acid this reaction?

Identify the conjugate base of HPO₄^2- in the reaction HCO₃^- + HPO₄^2- H₂CO₃ + PO₄^3-

Since arsenic is a nonmetal,As₂O₃ is expected to be a/an _____ oxide.

In the reaction,HSO₄^-(aq)+ OH^-(aq) SO₄^2-(aq)+ H₂O (l),the conjugate acid-base pairs are pair 1 pair 2

A solution is prepared by adding 0.10 mol of iron(III)nitrate,Fe(NO₃)₃,to 1.00 L of water.Which statement about the solution is correct?

Formic acid,which is a component of some insect venoms,has a K_a = 1.8 × 10^-⁴.What is the [H₃O⁺] in a solution that is initially 0.10 M formic acid,HCOOH?