Question 1

What is the molar solubility of MgF2 in a 0.40 M NaF solution? For MgF2,Ksp = 8.4 × 10-8.

Accepted Answer

A) 1.0 × 10-7 M 
B) 1.4 × 10-4 M 
C) 2.1 × 10-7 M 
D) 7.1 × 10-4 M 
E) 5.3 × 10-7 M 
A) 1.0 × 10-7 M 
B) 1.4 × 10-4 M 
C) 2.1 × 10-7 M 
D) 7.1 × 10-4 M 
E) 5.3 × 10-7 M

Question 2

Which of the following salts has the highest molar solubility in water?

Accepted Answer

A) CaCO3 (Ksp = 3.8 × 10-9) 
B) Ni(OH)2 (Ksp = 2.0 × 10-15) 
C) Fe(OH)2 (Ksp = 8 × 10-16) 
D) AgBr (Ksp = 5.0 × 10-13) 
E) PbI2 (Ksp = 6.5 × 10-9) 
A) CaCO3 (Ksp = 3.8 × 10-9) 
B) Ni(OH)2 (Ksp = 2.0 × 10-15) 
C) Fe(OH)2 (Ksp = 8 × 10-16) 
D) AgBr (Ksp = 5.0 × 10-13) 
E) PbI2 (Ksp = 6.5 × 10-9)

Question 3

Ksp for PbF2 is 4.0 ×10-8.If a 0.032 M NaF solution is saturated with PbF2,what is [Pb2+] in solution?

Accepted Answer

A) 4.1 × 10-11 M 
B) 1.3 × 10-9 M 
C) 1.3 × 10-6 M 
D) 1.2 × 10-3 M 
E) 3.9 × 10-5 M 
A) 4.1 × 10-11 M 
B) 1.3 × 10-9 M 
C) 1.3 × 10-6 M 
D) 1.2 × 10-3 M 
E) 3.9 × 10-5 M

Question 4

The figure below represents the result of adding which of the following aqueous solutions to a filtered,saturated solution of AgCl?

Accepted Answer

A) only NaCl(aq) 
B) only HNO3(aq) 
C) HCl(aq)or NaCl(aq) 
D) only HCl(aq) 
E) HCl(aq)or HNO3(aq) 
A) only NaCl(aq) 
B) only HNO3(aq) 
C) HCl(aq)or NaCl(aq) 
D) only HCl(aq) 
E) HCl(aq)or HNO3(aq)

Question 5

Cation C and anion A form an ionic compound for which Ksp = s2,where s is the molar solubility of the ionic compound.Which of Figures I-III represent(s)possible results of the mixing of an aqueous solution containing cation C with an aqueous solution containing anion A?

Accepted Answer

A) only I 
B) only III 
C) both I and III 
D) both I and II 
E) only II 
A) only I 
B) only III 
C) both I and III 
D) both I and II 
E) only II

Question 6

What is the molar equilibrium concentration of uncomplexed Fe2+(aq)in a solution composed of 1.4 mol Fe(CN)64− dissolved in 1.00 L of 0.33 M NaCN.Kf for Fe(CN)64− is   .

Accepted Answer

A)    M 
B)    M 
C)    M 
D)    M 
E)    M 
A)    M 
B)    M 
C)    M 
D)    M 
E)    M

Question 7

The solubility of calcium carbonate in water at 25°C is   g/L.What is the Ksp of this sparingly soluble salt?

Accepted Answer

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

Question 8

Pure water is saturated with slightly soluble calcium fluoride,CaF2.Which of the following is true concerning the equilibrium concentration of Ca2+?

Accepted Answer

A)    
B) [Ca2+] = [F-] 
C)    
D)    
E) [Ca2+] = Ksp 
A)    
B) [Ca2+] = [F-] 
C)    
D)    
E) [Ca2+] = Ksp

Question 9

The following reaction represents a step in the separation of which analytical group of cations?
Cu2+(aq)+ S2-(aq)→ CuS(s)

Accepted Answer

A) Analytical Group I 
B) Analytical Group III 
C) Analytical Group V 
D) Analytical Group IV 
E) Analytical Group II 
A) Analytical Group I 
B) Analytical Group III 
C) Analytical Group V 
D) Analytical Group IV 
E) Analytical Group II

Question 10

Which of the following solutions should be added to a solution containing both copper(II)ions and silver(I)ions in order to precipitate only one of the ions?

Accepted Answer

A) HCl(aq) 
B) H2S(aq) 
C) HNO3(aq) 
D) H2S(aq)+ HCl(aq) 
E) H2S(aq)+ HNO3(aq) 
A) HCl(aq) 
B) H2S(aq) 
C) HNO3(aq) 
D) H2S(aq)+ HCl(aq) 
E) H2S(aq)+ HNO3(aq)

Question 11

In the qualitative analysis scheme for metal ions,how are the Analytical Group III cations separated from the cations of Analytical Groups IV and V?

Accepted Answer

A) by addition of H2S in acidic solution,forming insoluble metal sulfides 
B) by addition of (NH4)2CO3 or (NH4)3PO4,forming insoluble metal carbonates or phosphates 
C) by addition of H2SO4,forming insoluble metal sulfates 
D) by addition of HCl,forming insoluble metal chlorides 
E) by addition of H2S in basic solution,forming insoluble metal sulfides or hydroxides 
A) by addition of H2S in acidic solution,forming insoluble metal sulfides 
B) by addition of (NH4)2CO3 or (NH4)3PO4,forming insoluble metal carbonates or phosphates 
C) by addition of H2SO4,forming insoluble metal sulfates 
D) by addition of HCl,forming insoluble metal chlorides 
E) by addition of H2S in basic solution,forming insoluble metal sulfides or hydroxides

Question 12

Rank the following salts in order of increasing molar solubility.

Accepted Answer

A) AgSCN 2CrO4 3PO4 
B) AgSCN 3PO4 2CrO4 
C) Ag3PO4 2CrO4 3PO4 2CrO4 
E) Ag2CrO4 3PO4 
A) AgSCN 2CrO4 3PO4 
B) AgSCN 3PO4 2CrO4 
C) Ag3PO4 2CrO4 3PO4 2CrO4 
E) Ag2CrO4 3PO4

Question 13

A(n)_____ is a Lewis base that bonds to a metal ion to form a complex ion.

Accepted Answer

A) ​ligand 
B) ​zwitterion 
C) ​substrate 
D) ​alkane 
E) ​arene 
A) ​ligand 
B) ​zwitterion 
C) ​substrate 
D) ​alkane 
E) ​arene

Question 14

What is the molar solubility of MgF2 in a 0.36 M Mg(NO3)2 solution? For MgF2,Ksp = 8.4 × 10-8.

Accepted Answer

A) 8.0 × 10-8 M 
B) 2.4 × 10-4 M 
C) 2.0 × 10-8 M 
D) 4.8 × 10-4 M 
E) 3.2 × 10-3 M 
A) 8.0 × 10-8 M 
B) 2.4 × 10-4 M 
C) 2.0 × 10-8 M 
D) 4.8 × 10-4 M 
E) 3.2 × 10-3 M

Question 15

The solubility of lead(II)sulfate is 4.0 × 10-2 g/L.What is the solubility product constant for lead(II)sulfate?

Accepted Answer

A) 1.7 × 10-8 
B) 1.3 × 10-4 
C) 1.6 × 10-3 
D) 4.6× 10-15 
E) 8.9 × 10-12 
A) 1.7 × 10-8 
B) 1.3 × 10-4 
C) 1.6 × 10-3 
D) 4.6× 10-15 
E) 8.9 × 10-12

Question 16

Which of the following salts has the lowest molar solubility in water?

Accepted Answer

A) Ni(OH)2 (Ksp = 2.0 × 10-15) 
B) Fe(OH)2 (Ksp = 8 × 10-16) 
C) PbI2 (Ksp = 6.5 × 10-9) 
D) CaCO3 (Ksp = 3.8 × 10-9) 
E) AgBr (Ksp = 5.0 × 10-13) 
A) Ni(OH)2 (Ksp = 2.0 × 10-15) 
B) Fe(OH)2 (Ksp = 8 × 10-16) 
C) PbI2 (Ksp = 6.5 × 10-9) 
D) CaCO3 (Ksp = 3.8 × 10-9) 
E) AgBr (Ksp = 5.0 × 10-13)

Question 17

Which sparingly soluble salt will exhibit the highest solubility at low pH's?

Accepted Answer

A) PbS (Ksp = 2.5 × 10-27) 
B) MnS (Ksp = 2.5 × 10-10) 
C) HgS (Ksp = 1.6 × 10-52) 
D) NiS (Ksp = 3 × 10-9) 
E) ZnS (Ksp = 1.1 × 10-21) 
A) PbS (Ksp = 2.5 × 10-27) 
B) MnS (Ksp = 2.5 × 10-10) 
C) HgS (Ksp = 1.6 × 10-52) 
D) NiS (Ksp = 3 × 10-9) 
E) ZnS (Ksp = 1.1 × 10-21)

Question 18

Suppose sodium hydroxide is added to a 0.0042 M solution of zinc nitrate such that the pH of the solution is 13.04.What is the equilibrium concentration of Zn2+?
Zn2+(aq)+ 4OH-(aq)  Zn(OH)42-(aq); Kf = 2.8 × 1015

Accepted Answer

A) 1.6 × 10-17 M 
B) 4.2 × 10-3 M 
C) 2.7 × 10-2 M 
D) 1.0 × 10-14 M 
E) 1.4 × 10-17 M 
A) 1.6 × 10-17 M 
B) 4.2 × 10-3 M 
C) 2.7 × 10-2 M 
D) 1.0 × 10-14 M 
E) 1.4 × 10-17 M

Question 19

What is the solubility (in g/L)of barium chromate at 25°C? The solubility product constant for barium chromate is 1.2 × 10-10 at 25°C.

Accepted Answer

A) 0.41 g/L 
B) 3.0 × 10-8 g/L 
C) 1.5 × 10-8 g/L 
D) 0.078 g/L 
E) 0.0027 g/L 
A) 0.41 g/L 
B) 3.0 × 10-8 g/L 
C) 1.5 × 10-8 g/L 
D) 0.078 g/L 
E) 0.0027 g/L

Question 20

What is the solubility product expression for Pb(IO3)2?

Accepted Answer

A) Ksp = [Pb2+][IO3-]2 
B) Ksp = [Pb4+][2IO32-]2 
C) Ksp = [Pb2+][2IO3-] 
D) Ksp = [Pb4+][IO32-]2 
E) Ksp = [Pb2+][2IO3-]2 
A) Ksp = [Pb2+][IO3-]2 
B) Ksp = [Pb4+][2IO32-]2 
C) Ksp = [Pb2+][2IO3-] 
D) Ksp = [Pb4+][IO32-]2 
E) Ksp = [Pb2+][2IO3-]2

Exam 17: Solubility and Complex-Ion Equilibria

What is the molar solubility of MgF2 in a 0.40 M NaF solution? For MgF2,Ksp = 8.4 × 10-8.

Which of the following salts has the highest molar solubility in water?

Ksp for PbF2 is 4.0 ×10-8.If a 0.032 M NaF solution is saturated with PbF2,what is [Pb2+] in solution?

The figure below represents the result of adding which of the following aqueous solutions to a filtered,saturated solution of AgCl?

Cation C and anion A form an ionic compound for which Ksp = s2,where s is the molar solubility of the ionic compound.Which of Figures I-III represent(s)possible results of the mixing of an aqueous solution containing cation C with an aqueous solution containing anion A?

What is the molar equilibrium concentration of uncomplexed Fe2+(aq)in a solution composed of 1.4 mol Fe(CN)64− dissolved in 1.00 L of 0.33 M NaCN.Kf for Fe(CN)64− is .

The solubility of calcium carbonate in water at 25°C is g/L.What is the Ksp of this sparingly soluble salt?

Pure water is saturated with slightly soluble calcium fluoride,CaF2.Which of the following is true concerning the equilibrium concentration of Ca2+?

The following reaction represents a step in the separation of which analytical group of cations? Cu2+(aq)+ S2-(aq)→ CuS(s)

Which of the following solutions should be added to a solution containing both copper(II)ions and silver(I)ions in order to precipitate only one of the ions?

In the qualitative analysis scheme for metal ions,how are the Analytical Group III cations separated from the cations of Analytical Groups IV and V?

Rank the following salts in order of increasing molar solubility.

A(n)_____ is a Lewis base that bonds to a metal ion to form a complex ion.

What is the molar solubility of MgF2 in a 0.36 M Mg(NO3)2 solution? For MgF2,Ksp = 8.4 × 10-8.

The solubility of lead(II)sulfate is 4.0 × 10-2 g/L.What is the solubility product constant for lead(II)sulfate?

Which of the following salts has the lowest molar solubility in water?

Which sparingly soluble salt will exhibit the highest solubility at low pH's?

Suppose sodium hydroxide is added to a 0.0042 M solution of zinc nitrate such that the pH of the solution is 13.04.What is the equilibrium concentration of Zn2+? Zn2+(aq)+ 4OH-(aq) Zn(OH)42-(aq); Kf = 2.8 × 1015

What is the solubility (in g/L)of barium chromate at 25°C? The solubility product constant for barium chromate is 1.2 × 10-10 at 25°C.

What is the solubility product expression for Pb(IO3)2?

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Filters

What is the molar solubility of MgF₂ in a 0.40 M NaF solution? For MgF₂,K_sp = 8.4 × 10^-8.

K_sp for PbF₂ is 4.0 ×10^-8.If a 0.032 M NaF solution is saturated with PbF₂,what is [Pb²⁺] in solution?

Cation C and anion A form an ionic compound for which K_sp = s²,where s is the molar solubility of the ionic compound.Which of Figures I-III represent(s)possible results of the mixing of an aqueous solution containing cation C with an aqueous solution containing anion A?

What is the molar equilibrium concentration of uncomplexed Fe²⁺(aq)in a solution composed of 1.4 mol Fe(CN)₆⁴⁻ dissolved in 1.00 L of 0.33 M NaCN.K_f for Fe(CN)₆⁴− is .

The solubility of calcium carbonate in water at 25°C is g/L.What is the K_sp of this sparingly soluble salt?

Pure water is saturated with slightly soluble calcium fluoride,CaF₂.Which of the following is true concerning the equilibrium concentration of Ca²⁺?

The following reaction represents a step in the separation of which analytical group of cations? Cu²⁺(aq)+ S^2-(aq)→ CuS(s)

What is the molar solubility of MgF₂ in a 0.36 M Mg(NO₃)₂ solution? For MgF₂,K_sp = 8.4 × 10^-8.

The solubility of lead(II)sulfate is 4.0 × 10^-2 g/L.What is the solubility product constant for lead(II)sulfate?

Suppose sodium hydroxide is added to a 0.0042 M solution of zinc nitrate such that the pH of the solution is 13.04.What is the equilibrium concentration of Zn²⁺? Zn²⁺(aq)+ 4OH^-(aq) Zn(OH)₄^2-(aq); K_f = 2.8 × 10¹⁵

What is the solubility (in g/L)of barium chromate at 25°C? The solubility product constant for barium chromate is 1.2 × 10^-10 at 25°C.

What is the solubility product expression for Pb(IO₃)₂?