Question 1

Silver oxalate,Ag2C2O4,has a molar solubility = 1.1 × 10-4 mol/L.Ag2C2O4 has a solubility product Ksp = ________.

Accepted Answer

Question 2

What is the approximate pH at the equivalence point of a weak acid-strong base titration if 25 mL of aqueous formic acid requires 29.80 mL of 0.2567 M NaOH? Ka = 1.8 × 10-4   for formic acid.

Accepted Answer

A) 2.13 
B) 5.56 
C) 8.44 
D) 11.87 
A) 2.13 
B) 5.56 
C) 8.44 
D) 11.87

Question 3

What is the pH of a buffer solution made by mixing 50.0 mL of 0.100 M potassium hydrogen phthalate with 13.6 mL of 0.100 M NaOH and diluting the mixture to 100.0 mL with water? The Ka2 for hydrogen phthalate is 3.1 × 10-6.

Accepted Answer

A) 3.25 
B) 5.08 
C) 5.51 
D) 5.94 
A) 3.25 
B) 5.08 
C) 5.51 
D) 5.94

Question 4

What volume of 5.00 × 10-3 M HNO3 is needed to titrate 20.00 mL of 5.00 × 10-3 M Ca(OH)2 to the equivalence point?

Accepted Answer

A) 2.50 mL 
B) 10.0 mL 
C) 20.0 mL 
D) 40.0 mL 
A) 2.50 mL 
B) 10.0 mL 
C) 20.0 mL 
D) 40.0 mL

Question 5

Which is the best acid to use in the preparation of a buffer with pH = 3.3?

Accepted Answer

A) HOI (Ka = 2.0 × 10-11) 
B) HNO2 (Ka = 4.5 × 10-4) 
C) HNO3 
D) HIO3 (Ka = 1.7 × 10-1) 
A) HOI (Ka = 2.0 × 10-11) 
B) HNO2 (Ka = 4.5 × 10-4) 
C) HNO3 
D) HIO3 (Ka = 1.7 × 10-1)

Question 6

What is the pH of a solution made by mixing 5.00 mL of 0.10 M acetic acid with 5.00 mL of 0.10 M KOH? Assume that the volumes of the solutions are additive.Ka = 1.8 × 10-5 for CH3CO2H.

Accepted Answer

A) 5.28 
B) 7.00 
C) 8.72 
D) 10.02 
A) 5.28 
B) 7.00 
C) 8.72 
D) 10.02

Question 7

What is the molar solubility of CaF2 in 0.10 M NaF solution at 25°C? The Ksp for CaF2 is 3.4 × 10-11.

Accepted Answer

A) 8.5 × 10-10 M 
B) 3.4 × 10-10 M 
C) 3.4 × 10-9 M 
D) 2.0 × 10-4 M 
A) 8.5 × 10-10 M 
B) 3.4 × 10-10 M 
C) 3.4 × 10-9 M 
D) 2.0 × 10-4 M

Question 8

The following plot shows a titration curve for the titration of 1.00 L of 1.00 M diprotic acid HS1U1B12S1U1B0A with NaOH.  
-Which point a-d represents the first equivalence point?

Accepted Answer

A) point a 
B) point b 
C) point c 
D) point d 
A) point a 
B) point b 
C) point c 
D) point d

Question 9

A buffer solution is prepared by dissolving 0.200 mol of NaH2PO4 and 0.100 mol of NaOH in enough water to make 1.00 L of solution.What is the pH of the H2PO4-/HPO42- buffer if the Ka2 = 6.2 × 10-8?

Accepted Answer

A) 6.91 
B) 7.21 
C) 7.51 
D) 7.71 
A) 6.91 
B) 7.21 
C) 7.51 
D) 7.71

Question 10

The following pictures represent solutions that contain a weak acid HA (pKS1U1B1aS1U1B0 = 5.0)and its potassium salt KA.Unshaded spheres represent H atoms and shaded spheres represent AS1U1P1-S1S1P0 ions.(KS1U1P1+S1S1P0,HS1U1B13S1U1B0OS1U1P1+S1S1P0,OHS1U1P1-S1S1P0,and solvent HS1U1B12S1U1B0O molecules have been omitted for clarity. )  
-Which solution has the highest pH?

Accepted Answer

A) (1) 
B) (2) 
C) (3) 
D) (4) 
A) (1) 
B) (2) 
C) (3) 
D) (4)

Question 11

Which of the following reactions are not consistent with the concept of acid base amphoterism?

Accepted Answer

A) Al(OH)3(s)+ OH-(aq)→ Al(OH)4-(aq) 
B) Al(OH)3(s)+ 3 H3O+(aq)→ Al3+(aq)+ 6 H2O(l) 
C) H2O(l)+ H2O(l)⇌ H3O+(aq)+ OH-(aq) 
D) Al(OH)3(s)⇌ Al3+(aq)+ 3 OH-(aq) 
A) Al(OH)3(s)+ OH-(aq)→ Al(OH)4-(aq) 
B) Al(OH)3(s)+ 3 H3O+(aq)→ Al3+(aq)+ 6 H2O(l) 
C) H2O(l)+ H2O(l)⇌ H3O+(aq)+ OH-(aq) 
D) Al(OH)3(s)⇌ Al3+(aq)+ 3 OH-(aq)

Question 12

The following pictures represent solutions at various stages in the titration of a weak diprotic acid HS1U1B12S1U1B0A with aqueous KOH.Unshaded spheres represent H atoms,black spheres represent oxygen atoms,and shaded spheres represent AS1U1P12-S1S1P0 ions.(KS1U1P1+S1S1P0,HS1U1B13S1U1B0OS1U1P1+S1S1P0 initially present,OHS1U1P1-S1S1P0 initially present and solvent water molecules have been omitted for clarity).  
-Which picture represents the system beyond the second equivalence point?

Accepted Answer

A) (1) 
B) (2) 
C) (3) 
D) (4) 
A) (1) 
B) (2) 
C) (3) 
D) (4)

Question 13

Calculate the Ksp for silver sulfite if the solubility of Ag2SO3 in pure water is 4.6 × 10-3 g/L.

Accepted Answer

A) 3.8 × 10-15 
B) 1.5 × 10-14 
C) 2.4 × 10-10 
D) 4.8 × 10-10 
A) 3.8 × 10-15 
B) 1.5 × 10-14 
C) 2.4 × 10-10 
D) 4.8 × 10-10

Question 14

The addition of ________ mL of 0.3000 M NaOH is required to titrate 60.00 mL of 0.2000 M HCl to the equivalence point,which occurs at a pH of ________.

Accepted Answer

The answer of The addition of ________ mL of 0.3000...

Question 15

Which metal sulfides can be precipitated from a solution that is 0.01 M in Mn2+,Zn2+,Pb2+ and Cu2+ and 0.10 M in H2S at a pH of 0.50?

Accepted Answer

A) MnS 
B) CuS 
C) PbS,CuS 
D) ZnS,PbS,CuS 
A) MnS 
B) CuS 
C) PbS,CuS 
D) ZnS,PbS,CuS

Question 16

What is the pH of a buffer system prepared by dissolving 10.70 grams of NH4Cl and 30.00 mL of 12 M NH3 in enough water to make 1.000 L of solution? Kb = 1.80 × 10-5 for NH3.

Accepted Answer

A) 9.00 
B) 9.26 
C) 9.51 
D) 11.32 
A) 9.00 
B) 9.26 
C) 9.51 
D) 11.32

Question 17

The following pictures represent solutions at various points in the titration of a weak acid HA with aqueous KOH.Unshaded spheres represent H atoms,black spheres represent oxygen atoms,and shaded spheres represent AS1U1P1-S1S1P0 ions.(KS1U1P1+S1S1P0,HS1U1B13S1U1B0OS1U1P1+S1S1P0 initially present,OHS1U1P1-S1S1P0 initially present and solvent water molecules have been omitted for clarity).  
-Which picture represents the solution before the addition of any KOH?

Accepted Answer

A) (1) 
B) (2) 
C) (3) 
D) (4) 
A) (1) 
B) (2) 
C) (3) 
D) (4)

Question 18

Which of the following combinations of chemicals could be used to make a buffer solution?

Accepted Answer

A) HCl/KOH 
B) HCl/NH3 
C) HBr/H3PO4 
D) KOH/NH3 
A) HCl/KOH 
B) HCl/NH3 
C) HBr/H3PO4 
D) KOH/NH3

Question 19

Use the graphs below to answer the following questions.  
-What is the characteristic pH-titration curve for the titration of a weak acid by a strong base?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
A) A 
B) B 
C) C 
D) D

Question 20

Calculate the solubility (in g/L)of silver carbonate in water at 25°C if the Ksp for Ag2CO3 is 8.4 × 10-12.

Accepted Answer

A) 8.0 × 10-4 g/L 
B) 3.5 × 10-2 g/L 
C) 4.4 × 10-2 g/L 
D) 5.6 × 10-2 g/L 
A) 8.0 × 10-4 g/L 
B) 3.5 × 10-2 g/L 
C) 4.4 × 10-2 g/L 
D) 5.6 × 10-2 g/L

Exam 16: Applications of Aqueous Equilibria

Silver oxalate,Ag2C2O4,has a molar solubility = 1.1 × 10-4 mol/L.Ag2C2O4 has a solubility product Ksp = ________.

What is the approximate pH at the equivalence point of a weak acid-strong base titration if 25 mL of aqueous formic acid requires 29.80 mL of 0.2567 M NaOH? Ka = 1.8 × 10-4 for formic acid.

What is the pH of a buffer solution made by mixing 50.0 mL of 0.100 M potassium hydrogen phthalate with 13.6 mL of 0.100 M NaOH and diluting the mixture to 100.0 mL with water? The Ka2 for hydrogen phthalate is 3.1 × 10-6.

What volume of 5.00 × 10-3 M HNO3 is needed to titrate 20.00 mL of 5.00 × 10-3 M Ca(OH)2 to the equivalence point?

Which is the best acid to use in the preparation of a buffer with pH = 3.3?

What is the pH of a solution made by mixing 5.00 mL of 0.10 M acetic acid with 5.00 mL of 0.10 M KOH? Assume that the volumes of the solutions are additive.Ka = 1.8 × 10-5 for CH3CO2H.

What is the molar solubility of CaF2 in 0.10 M NaF solution at 25°C? The Ksp for CaF2 is 3.4 × 10-11.

The following plot shows a titration curve for the titration of 1.00 L of 1.00 M diprotic acid H2A with NaOH. -Which point a-d represents the first equivalence point?

A buffer solution is prepared by dissolving 0.200 mol of NaH2PO4 and 0.100 mol of NaOH in enough water to make 1.00 L of solution.What is the pH of the H2PO4-/HPO42- buffer if the Ka2 = 6.2 × 10-8?

The following pictures represent solutions that contain a weak acid HA (pKa = 5.0)and its potassium salt KA.Unshaded spheres represent H atoms and shaded spheres represent A- ions.(K+,H3O+,OH-,and solvent H2O molecules have been omitted for clarity. ) -Which solution has the highest pH?

Which of the following reactions are not consistent with the concept of acid base amphoterism?

Calculate the Ksp for silver sulfite if the solubility of Ag2SO3 in pure water is 4.6 × 10-3 g/L.

The addition of ________ mL of 0.3000 M NaOH is required to titrate 60.00 mL of 0.2000 M HCl to the equivalence point,which occurs at a pH of ________.

Which metal sulfides can be precipitated from a solution that is 0.01 M in Mn2+,Zn2+,Pb2+ and Cu2+ and 0.10 M in H2S at a pH of 0.50?

What is the pH of a buffer system prepared by dissolving 10.70 grams of NH4Cl and 30.00 mL of 12 M NH3 in enough water to make 1.000 L of solution? Kb = 1.80 × 10-5 for NH3.

Which of the following combinations of chemicals could be used to make a buffer solution?

Use the graphs below to answer the following questions. -What is the characteristic pH-titration curve for the titration of a weak acid by a strong base?

Calculate the solubility (in g/L)of silver carbonate in water at 25°C if the Ksp for Ag2CO3 is 8.4 × 10-12.

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Filters

Silver oxalate,Ag₂C₂O₄,has a molar solubility = 1.1 × 10^-4 mol/L.Ag₂C₂O₄ has a solubility product K_sp = ________.

What is the approximate pH at the equivalence point of a weak acid-strong base titration if 25 mL of aqueous formic acid requires 29.80 mL of 0.2567 M NaOH? K_a = 1.8 × 10^-4 for formic acid.

What is the pH of a buffer solution made by mixing 50.0 mL of 0.100 M potassium hydrogen phthalate with 13.6 mL of 0.100 M NaOH and diluting the mixture to 100.0 mL with water? The K_a2 for hydrogen phthalate is 3.1 × 10^-6.

What volume of 5.00 × 10^-3 M HNO₃ is needed to titrate 20.00 mL of 5.00 × 10^-3 M Ca(OH)₂ to the equivalence point?

What is the pH of a solution made by mixing 5.00 mL of 0.10 M acetic acid with 5.00 mL of 0.10 M KOH? Assume that the volumes of the solutions are additive.K_a = 1.8 × 10^-5 for CH₃CO₂H.

What is the molar solubility of CaF₂ in 0.10 M NaF solution at 25°C? The K_sp for CaF₂ is 3.4 × 10^-11.

The following plot shows a titration curve for the titration of 1.00 L of 1.00 M diprotic acid H₂A with NaOH. -Which point a-d represents the first equivalence point?

A buffer solution is prepared by dissolving 0.200 mol of NaH₂PO₄ and 0.100 mol of NaOH in enough water to make 1.00 L of solution.What is the pH of the H₂PO₄^-/HPO₄^2- buffer if the K_a2 = 6.2 × 10^-8?

The following pictures represent solutions that contain a weak acid HA (pK_a = 5.0)and its potassium salt KA.Unshaded spheres represent H atoms and shaded spheres represent A^- ions.(K⁺,H₃O⁺,OH^-,and solvent H₂O molecules have been omitted for clarity. ) -Which solution has the highest pH?

Calculate the K_sp for silver sulfite if the solubility of Ag₂SO₃ in pure water is 4.6 × 10^-3g/L.

The addition of mL of 0.3000 M NaOH is required to titrate 60.00 mL of 0.2000 M HCl to the equivalence point,which occurs at a pH of .

Which metal sulfides can be precipitated from a solution that is 0.01 M in Mn²⁺,Zn²⁺,Pb²⁺ and Cu²⁺ and 0.10 M in H₂S at a pH of 0.50?

What is the pH of a buffer system prepared by dissolving 10.70 grams of NH₄Cl and 30.00 mL of 12 M NH₃ in enough water to make 1.000 L of solution? K_b = 1.80 × 10^-5for NH₃.

Calculate the solubility (in g/L)of silver carbonate in water at 25°C if the K_sp for Ag₂CO₃ is 8.4 × 10^-12.