Given: Ksp values are 2.32 × 10−9 for Ca(C2O4) and 2.5 × 10−27 for La2(C2O4)3; pKa1 = 1.25 and pKa2 = 3.81 for oxalic acid. If a solution contains 0.020M Ca2+ and 0.020M La3+, what concentration of HCl is needed to precipitate La2(C2O4)3.9H2O but not Ca(C2O4).H2O ? The concentration of oxalic acid is 1.0 M.

A) 6.5 M B) 9.7 M C) 4.8 M D) 2.9 M E) 8.7 M A) 6.5 M B) 9.7 M C) 4.8 M D) 2.9 M E) 8.7 M

Exam 17: Solubility and Complexation Equilibriums

If the K_fof $\mathrm { AgCl } _ { 2 } ^ { - }$ is 1.1×10⁵ and the equilibrium constant of the reaction is 1.9×10^-5, what is the K_spof AgCl at $25 ^ { \circ } \mathrm { C }$ ?

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Question 1

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Verified

Oxides of metallic elements are generally acidic oxides.

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(True/False)

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Question 2

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False

For which of the following salts is ion pair formation considered relatively unimportant?

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Question 3

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Ion pair formation is most important for salts that contain monopositive cations.

(True/False)

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Question 4

The ions in an ion pair migrate as a single unit, whose net charge is the sum of the charges on the ions.

(True/False)

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Question 5

Given: K_sp values are 2.32 × 10⁻⁹ for Ca(C₂O₄) and 2.5 × 10⁻²⁷ for La₂(C₂O₄)₃; pK_a1 = 1.25 and pK_a2 = 3.81 for oxalic acid. If a solution contains 0.020M Ca²⁺ and 0.020M La³⁺, what concentration of HCl is needed to precipitate La₂(C₂O₄)₃.9H₂O but not Ca(C₂O₄).H₂O ? The concentration of oxalic acid is 1.0 M.

(Multiple Choice)

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Question 6

Explain the formation of an ion pair.

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Question 7

A(n) _____ consists of a cation and an anion that are in intimate contact in solution, rather than separated by solvent.

(Short Answer)

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Question 8

Which of the following is true if the ion product is equal to the solubility product?

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Question 9

Solubility products are determined experimentally by directly measuring the concentration of one of the component ions in a given amount of water.

(True/False)

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Question 10

A(n) _____ is an ion or a molecule that contains one or more pairs of electrons that can be shared with the central metal in a metal complex.

(Short Answer)

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Question 11

Which of the following acids is most likely to show the highest rate of incomplete dissociation?

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Question 12

Explain the steps in a typical qualitative analysis scheme for a solution that contains several metal ions.

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Question 13

An acidic pH dramatically decreases the solubility of virtually all sparingly soluble salts whose anion is the conjugate base of a weak acid.

(True/False)

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Question 14

Zn(II) forms the complex ion [Zn(NH₃)₄]²⁺ through equilibrium reactions in which ammonia replaces coordinated water molecules in a stepwise manner. If log K₁ = 3.35, log K₂ = 2.74, log K₃ = 3.50, and log K₄ = 2.25, what is the overall K_f?

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Question 15

Oxides of elements that are soluble in both acidic and basic solutions are called _____.

(Short Answer)

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Question 16

A(n) _____ is a species formed between a central metal ion and one or more surrounding ligands, molecules or ions that contain at least one lone pair of electrons.

(Short Answer)

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Question 17

The equilibrium constant for the dissolution of a sparingly soluble salt is the _____ of the salt.

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Question 18

If the K_sp of CuCl₂ is 1.72×10^-7 and the equilibrium constant of the reaction is 8.6×10^-2, what is the K_f of $\left[ \mathrm { CuCl } _ { 3 } \right] ^ { 2 - }$ ?

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Question 19

Due to their high electronegativities, nonmetals form oxides with covalent bonds to oxygen.

(True/False)

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Question 20

Showing 1 - 20 of 85

Exam 17: Solubility and Complexation Equilibriums

If the Kf of AgCl2−\mathrm { AgCl } _ { 2 } ^ { - }AgCl2−​ is 1.1×105 and the equilibrium constant of the reaction is 1.9×10-5, what is the Ksp of AgCl at 25∘C25 ^ { \circ } \mathrm { C }25∘C ?

Oxides of metallic elements are generally acidic oxides.

For which of the following salts is ion pair formation considered relatively unimportant?

Ion pair formation is most important for salts that contain monopositive cations.

The ions in an ion pair migrate as a single unit, whose net charge is the sum of the charges on the ions.

Explain the formation of an ion pair.

A(n) _____ consists of a cation and an anion that are in intimate contact in solution, rather than separated by solvent.

Which of the following is true if the ion product is equal to the solubility product?

Solubility products are determined experimentally by directly measuring the concentration of one of the component ions in a given amount of water.

A(n) _____ is an ion or a molecule that contains one or more pairs of electrons that can be shared with the central metal in a metal complex.

Which of the following acids is most likely to show the highest rate of incomplete dissociation?

Explain the steps in a typical qualitative analysis scheme for a solution that contains several metal ions.

An acidic pH dramatically decreases the solubility of virtually all sparingly soluble salts whose anion is the conjugate base of a weak acid.

Zn(II) forms the complex ion [Zn(NH3)4]2+ through equilibrium reactions in which ammonia replaces coordinated water molecules in a stepwise manner. If log K1 = 3.35, log K2 = 2.74, log K3 = 3.50, and log K4 = 2.25, what is the overall Kf?

Oxides of elements that are soluble in both acidic and basic solutions are called _____.

A(n) _____ is a species formed between a central metal ion and one or more surrounding ligands, molecules or ions that contain at least one lone pair of electrons.

The equilibrium constant for the dissolution of a sparingly soluble salt is the _____ of the salt.

If the Ksp of CuCl2 is 1.72×10-7 and the equilibrium constant of the reaction is 8.6×10-2, what is the Kf of [CuCl3]2−\left[ \mathrm { CuCl } _ { 3 } \right] ^ { 2 - }[CuCl3​]2− ?

Due to their high electronegativities, nonmetals form oxides with covalent bonds to oxygen.

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If the K_fof $\mathrm { AgCl } _ { 2 } ^ { - }$ is 1.1×10⁵ and the equilibrium constant of the reaction is 1.9×10^-5, what is the K_spof AgCl at $25 ^ { \circ } \mathrm { C }$ ?

Zn(II) forms the complex ion [Zn(NH₃)₄]²⁺ through equilibrium reactions in which ammonia replaces coordinated water molecules in a stepwise manner. If log K₁ = 3.35, log K₂ = 2.74, log K₃ = 3.50, and log K₄ = 2.25, what is the overall K_f?

If the K_sp of CuCl₂ is 1.72×10^-7 and the equilibrium constant of the reaction is 8.6×10^-2, what is the K_f of $\left[ \mathrm { CuCl } _ { 3 } \right] ^ { 2 - }$ ?