Question 1

The molar solubility of Ba3(PO4)2 is 8.89 × 10-9 M in pure water.Calculate the Ksp for Ba3(PO4)2.

Accepted Answer

A)  4.94 × 10-49 
B)  5.55 × 10-41 
C)  5.33 × 10-37 
D)  8.16 × 10-31 
E)  6.00 × 10-39  
A)  4.94 × 10-49 
B)  5.55 × 10-41 
C)  5.33 × 10-37 
D)  8.16 × 10-31 
E)  6.00 × 10-39

Question 2

What is the molar solubility of AgCl in 0.30 M NH3? Ksp for AgCl is 1.8 × 10-10 and Kf for Ag(NH3)2+ is 1.7 × 107.

Accepted Answer

A)  1.3 × 10-5 M 
B)  1.6 × 10-2 M 
C)  1.7 × 10-2 M 
D)  5.5 × 10-2 M 
A)  1.3 × 10-5 M 
B)  1.6 × 10-2 M 
C)  1.7 × 10-2 M 
D)  5.5 × 10-2 M

Question 3

A 25.0 mL sample of 0.150 M hydrofluoric acid is titrated with a 0.150 M NaOH solution.What is the pH after 26.0 mL of base is added? The Ka of hydrofluoric acid is 6.8 × 10-4.

Accepted Answer

A)  2.54 
B)  11.47 
C)  7.00 
D)  3.15 
E)  3.18 
A)  2.54 
B)  11.47 
C)  7.00 
D)  3.15 
E)  3.18

Question 4

Calculate the pH of a solution that is 0.111 M in sodium formate (NaHCO2)and   in formic acid (HCO2H).The Ka of formic acid is 1.77 × 10-4.

Accepted Answer

A)  3.387 
B)  4.103 
C)  14.36 
D)  10.61 
E)  5.296 
A)  3.387 
B)  4.103 
C)  14.36 
D)  10.61 
E)  5.296

Question 5

You wish to prepare an HC2H3O2 buffer with a pH of 5.24.If the pKa of is 4.74,what ratio of C2H3O2⁻/HC2H3O2 must you use?

Accepted Answer

A)  0.10 
B)  0.50 
C)  0.32 
D)  3.16 
E)  7.0 
A)  0.10 
B)  0.50 
C)  0.32 
D)  3.16 
E)  7.0

Question 6

A sample contains Ba3(PO4)2, CdS,AgCl,NH4Cl,and ZnS.Identify the precipitate after the addition of 6 M HCl.

Accepted Answer

A)  Ba3(PO4)2 
B)  CuS 
C)  AgCl 
D)  NH4Cl 
E)  NiS 
A)  Ba3(PO4)2 
B)  CuS 
C)  AgCl 
D)  NH4Cl 
E)  NiS

Question 7

Formic acid (HCO2H,Ka = 1.8 × 10-4)is the principal component in the venom of stinging ants.What is the molarity of a formic acid solution if 25.00 mL of the formic acid solution requires 29.80 mL of 0.0567 M NaOH to reach the equivalence point?

Accepted Answer

A)  0.0134 M 
B)  0.0476 M 
C)  0.0567 M 
D)  0.0676 M 
A)  0.0134 M 
B)  0.0476 M 
C)  0.0567 M 
D)  0.0676 M

Question 8

What is the molar solubility of Mg(OH)2 in a basic solution with a pH of 12.50? Ksp for Mg(OH)2 is 5.6 × 10-12.

Accepted Answer

A)  1.8 × 10-10 M 
B)  5.6 × 10-9 M 
C)  2.4 × 10-6 M 
D)  1.1 × 10-4 M 
A)  1.8 × 10-10 M 
B)  5.6 × 10-9 M 
C)  2.4 × 10-6 M 
D)  1.1 × 10-4 M

Question 9

Calculate the pH of a solution formed by mixing 250.0 mL of 0.15 M HCHO2 with 100.0 mL of 0.20 M LiCHO2.The Ka for HCHO2 is 1.8 × 10-4.

Accepted Answer

A)  3.87 
B)  3.74 
C)  10.53 
D)  3.47 
E)  10.13 
A)  3.87 
B)  3.74 
C)  10.53 
D)  3.47 
E)  10.13

Question 10

A 25.0-mL sample of 0.150 M benzoic acid is titrated with a 0.150 M NaOH solution.What is the pH before any base is added? The Ka of benzoic acid is 6.3 × 10-5.

Accepted Answer

A)  4.19 
B)  6.5 × 10-5 
C)  4.20 
D)  3.38 
E)  2.4 × 103 
A)  4.19 
B)  6.5 × 10-5 
C)  4.20 
D)  3.38 
E)  2.4 × 103

Question 11

A 25.0-mL sample of 0.150 M hydrocyanic acid is titrated with a 0.150 M NaOH solution.What is the pH after 13.3 mL of base is added? The Ka of hydrocyanic acid is 4.9 × 10-10.

Accepted Answer

A)  9.04 
B)  1.34 
C)  5.32 
D)  9.37 
E)  9.25 
A)  9.04 
B)  1.34 
C)  5.32 
D)  9.37 
E)  9.25

Question 12

Determine the molar solubility for Al(OH)3 in pure water.Ksp for Al(OH)3 = 1.3 × 10-33.

Accepted Answer

A)  3.6 × 10-12 M 
B)  2.2 × 10-10 M 
C)  4.8 × 10-35 M 
D)  2.6 × 10-9 M 
E)  6.0 × 10-19 M 
A)  3.6 × 10-12 M 
B)  2.2 × 10-10 M 
C)  4.8 × 10-35 M 
D)  2.6 × 10-9 M 
E)  6.0 × 10-19 M

Question 13

Give the expression for the solubility product constant for Cr2(CO3)3.

Accepted Answer

A)  [Cr3+]2[CO32-]3 
B)    
C)    
D)    
E)  [3Cr3+]3[2CO32-]2 
A)  [Cr3+]2[CO32-]3 
B)    
C)    
D)    
E)  [3Cr3+]3[2CO32-]2

Question 14

Determine the molar solubility for Cd(OH)2 in pure water.Ksp for Cd(OH)2 is 2.0 × 10-14.

Accepted Answer

A)  2.0 × 10-14 M 
B)  1.7 × 10-5 M 
C)  6.6 × 10-8 M 
D)  3.5 × 10-6 M 
E)  2.9 × 10-6 M 
A)  2.0 × 10-14 M 
B)  1.7 × 10-5 M 
C)  6.6 × 10-8 M 
D)  3.5 × 10-6 M 
E)  2.9 × 10-6 M

Question 15

Sodium hypochlorite,NaOCl,is the active ingredient in household bleach.What is the concentration of hypochlorite ion if 20.00 mL of bleach requires 32.00 mL of 0.500 M HCl to reach the equivalence point?

Accepted Answer

A)  0.300 M 
B)  0.312 M 
C)  0.800 M 
D)  1.30 M 
A)  0.300 M 
B)  0.312 M 
C)  0.800 M 
D)  1.30 M

Question 16

Give the equation for a saturated solution in comparing Q with Ksp.

Accepted Answer

A)  Q > Ksp 
B)  Q sp 
C)  Q = Ksp 
D)  Q ≠ Ksp 
E)  none of the above 
A)  Q > Ksp 
B)  Q sp 
C)  Q = Ksp 
D)  Q ≠ Ksp 
E)  none of the above

Question 17

Which of the following solutions is a good buffer system?

Accepted Answer

A)  a solution that is 0.10 M NaCl and 0.10 M HCl 
B)  a solution that is 0.10 M HCN and 0.10 M LiCN 
C)  a solution that is 0.10 M NaOH and 0.10 M HNO3 
D)  a solution that is 0.10 M HNO3 and 0.10 M NaNO3 
E)  a solution that is 0.10 M HCN and 0.10 M K Br 
A)  a solution that is 0.10 M NaCl and 0.10 M HCl 
B)  a solution that is 0.10 M HCN and 0.10 M LiCN 
C)  a solution that is 0.10 M NaOH and 0.10 M HNO3 
D)  a solution that is 0.10 M HNO3 and 0.10 M NaNO3 
E)  a solution that is 0.10 M HCN and 0.10 M K Br

Question 18

A 100.0 mL sample of 0.20 M HF is titrated with 0.10 M KOH.Determine the pH of the solution after the addition of 300.0 mL of KOH.The Ka of HF is 3.5 × 10-4.

Accepted Answer

A)  12.40 
B)  9.33 
C)  5.06 
D)  8.94 
E)  12.00 
A)  12.40 
B)  9.33 
C)  5.06 
D)  8.94 
E)  12.00

Question 19

Calculate the pH of a solution formed by mixing 200.0 mL of 0.30 M HClO with 100.0 mL of 0.20 M KClO.The Ka for HClO is 2.9 × 10-8.

Accepted Answer

A)  5.99 
B)  8.01 
C)  7.54 
D)  7.06 
E)  6.46 
A)  5.99 
B)  8.01 
C)  7.54 
D)  7.06 
E)  6.46

Question 20

Identify the most common indicator.

Accepted Answer

A)  alizarin 
B)  bromophenol blue 
C)  phenol red 
D)  phenolphthalein 
E)  thymolphthalein 
A)  alizarin 
B)  bromophenol blue 
C)  phenol red 
D)  phenolphthalein 
E)  thymolphthalein

Exam 18: Aqueous Ionic Equilibrium

The molar solubility of Ba3(PO4)2 is 8.89 × 10-9 M in pure water.Calculate the Ksp for Ba3(PO4)2.

What is the molar solubility of AgCl in 0.30 M NH3? Ksp for AgCl is 1.8 × 10-10 and Kf for Ag(NH3)2+ is 1.7 × 107.

A 25.0 mL sample of 0.150 M hydrofluoric acid is titrated with a 0.150 M NaOH solution.What is the pH after 26.0 mL of base is added? The Ka of hydrofluoric acid is 6.8 × 10-4.

Calculate the pH of a solution that is 0.111 M in sodium formate (NaHCO2)and in formic acid (HCO2H).The Ka of formic acid is 1.77 × 10-4.

You wish to prepare an HC2H3O2 buffer with a pH of 5.24.If the pKa of is 4.74,what ratio of C2H3O2⁻/HC2H3O2 must you use?

A sample contains Ba3(PO4)2, CdS,AgCl,NH4Cl,and ZnS.Identify the precipitate after the addition of 6 M HCl.

Formic acid (HCO2H,Ka = 1.8 × 10-4)is the principal component in the venom of stinging ants.What is the molarity of a formic acid solution if 25.00 mL of the formic acid solution requires 29.80 mL of 0.0567 M NaOH to reach the equivalence point?

What is the molar solubility of Mg(OH)2 in a basic solution with a pH of 12.50? Ksp for Mg(OH)2 is 5.6 × 10-12.

Calculate the pH of a solution formed by mixing 250.0 mL of 0.15 M HCHO2 with 100.0 mL of 0.20 M LiCHO2.The Ka for HCHO2 is 1.8 × 10-4.

A 25.0-mL sample of 0.150 M benzoic acid is titrated with a 0.150 M NaOH solution.What is the pH before any base is added? The Ka of benzoic acid is 6.3 × 10-5.

A 25.0-mL sample of 0.150 M hydrocyanic acid is titrated with a 0.150 M NaOH solution.What is the pH after 13.3 mL of base is added? The Ka of hydrocyanic acid is 4.9 × 10-10.

Determine the molar solubility for Al(OH)3 in pure water.Ksp for Al(OH)3 = 1.3 × 10-33.

Give the expression for the solubility product constant for Cr2(CO3)3.

Determine the molar solubility for Cd(OH)2 in pure water.Ksp for Cd(OH)2 is 2.0 × 10-14.

Sodium hypochlorite,NaOCl,is the active ingredient in household bleach.What is the concentration of hypochlorite ion if 20.00 mL of bleach requires 32.00 mL of 0.500 M HCl to reach the equivalence point?

Give the equation for a saturated solution in comparing Q with Ksp.

Which of the following solutions is a good buffer system?

A 100.0 mL sample of 0.20 M HF is titrated with 0.10 M KOH.Determine the pH of the solution after the addition of 300.0 mL of KOH.The Ka of HF is 3.5 × 10-4.

Calculate the pH of a solution formed by mixing 200.0 mL of 0.30 M HClO with 100.0 mL of 0.20 M KClO.The Ka for HClO is 2.9 × 10-8.

Identify the most common indicator.

Essentials: Units, Measurements, and Problem Solving

Atoms

The Quantum Mechanical Model of the Atom

Periodic Properties of the Elements

Molecules and Compounds

Chemical Bonding I

Chemical Bonding Ii

Chemical Reactions and Chemical Quantities

Introduction to Solutions and Aqueous Reactions

Thermochemistry

Gases

Liquids, Solids, and Intermolecular Forces

Crystalline Solids and Modern Materials

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry

Transition Metals and Coordination Compounds

Filters

The molar solubility of Ba₃(PO₄)₂ is 8.89 × 10^-9M in pure water.Calculate the K_sp for Ba₃(PO₄)₂.

What is the molar solubility of AgCl in 0.30 M NH₃? K_sp for AgCl is 1.8 × 10^-10 and K_f for Ag(NH₃)₂⁺ is 1.7 × 10⁷.

A 25.0 mL sample of 0.150 M hydrofluoric acid is titrated with a 0.150 M NaOH solution.What is the pH after 26.0 mL of base is added? The K_a of hydrofluoric acid is 6.8 × 10^-4.

Calculate the pH of a solution that is 0.111 M in sodium formate (NaHCO₂)and in formic acid (HCO₂H).The K_a of formic acid is 1.77 × 10^-4.

You wish to prepare an HC₂H₃O₂ buffer with a pH of 5.24.If the pK_a of is 4.74,what ratio of C₂H₃O₂⁻/HC₂H₃O₂ must you use?

A sample contains Ba₃(PO₄)₂,CdS,AgCl,NH₄Cl,and ZnS.Identify the precipitate after the addition of 6 M HCl.

Formic acid (HCO₂H,K_a = 1.8 × 10^-4)is the principal component in the venom of stinging ants.What is the molarity of a formic acid solution if 25.00 mL of the formic acid solution requires 29.80 mL of 0.0567 M NaOH to reach the equivalence point?

What is the molar solubility of Mg(OH)₂ in a basic solution with a pH of 12.50? K_spfor Mg(OH)₂ is 5.6 × 10^-12.

Calculate the pH of a solution formed by mixing 250.0 mL of 0.15 M HCHO₂ with 100.0 mL of 0.20 M LiCHO₂.The K_a for HCHO₂ is 1.8 × 10^-4.

A 25.0-mL sample of 0.150 M benzoic acid is titrated with a 0.150 M NaOH solution.What is the pH before any base is added? The K_a of benzoic acid is 6.3 × 10^-5.

A 25.0-mL sample of 0.150 M hydrocyanic acid is titrated with a 0.150 M NaOH solution.What is the pH after 13.3 mL of base is added? The K_a of hydrocyanic acid is 4.9 × 10^-10.

Determine the molar solubility for Al(OH)₃ in pure water.K_sp for Al(OH)₃ = 1.3 × 10^-33.

Give the expression for the solubility product constant for Cr₂(CO₃)₃.

Determine the molar solubility for Cd(OH)₂ in pure water.K_sp for Cd(OH)₂ is 2.0 × 10^-14.

Give the equation for a saturated solution in comparing Q with K_s_p.

A 100.0 mL sample of 0.20 M HF is titrated with 0.10 M KOH.Determine the pH of the solution after the addition of 300.0 mL of KOH.The K_a of HF is 3.5 × 10^-4.

Calculate the pH of a solution formed by mixing 200.0 mL of 0.30 M HClO with 100.0 mL of 0.20 M KClO.The K_a for HClO is 2.9 × 10^-8.