Question 1

What is the value of the dissociation constant,K_d,for the complex ion Zn(NH₃)₄²⁺? For Zn(NH₃)₄²⁺,K_f = 2.9 × 10⁹.

Accepted Answer

The dissociation constant, Kd, is the inverse of the formation constant, Kf. Therefore, Kd = 1/Kf = 1/(2.9 × 10^9) = 3.4 × 10^-10.

Question 2

For which of the following salts would the addition of nitric acid increase its solubility?

Accepted Answer

The answer of For which of the following salts would...

Question 3

The figure below represents the results of adding NH₃ to a saturated solution of an ionic compound.Which of the following could the ionic compound be?

Accepted Answer

The addition of NH₃ suggests a decrease in solubility due to the formation of a precipitate. The only compound that fits this description is AgCl, which is a sparingly soluble compound. The other options either have high solubilities or are not known to form precipitates when added to NH₃.

Question 4

Suppose hydrogen sulfide is added to a solution that is 0.10 M in Cu²⁺,Pb²⁺,and Ni²⁺ such that the concentration of H₂S is 0.10 M.When the pH of the solution is adjusted to 1.00,a precipitate forms.What is the composition of the precipitate? H₂S(aq)+ 2H₂O(l) 2H₃O⁺(aq)+ S^2-(aq); K_c = 1.1 × 10^-20 Salt K_sp CuS 6)0 × 10^-36 PbS 2)5 × 10^-27 NiS 3)0 × 10^-19

Accepted Answer

The answer of Suppose hydrogen sulfide is added to a...

Question 5

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

Accepted Answer

The answer of Which sparingly soluble salt will exhibit the...

Question 6

You have two salts,AgX and AgY,with very similar K_sp values.You know that K_a for HX is much greater than K_a for HY.Which statement will be true?

Accepted Answer

Since the Ks of HX is greater than that of HY, it means that HX will ionize more in water, producing more H+ ions which will react with AgX and AgY to form insoluble AgX and AgY salts. Therefore, AgX and AgY will be less soluble in acidic solution than in pure water. However, since AgY has a smaller Ks value than AgX, it will be more soluble in acidic solution than AgX. Therefore, the correct statement is that AgY is more soluble in acidic solution.

Question 7

Cyanide ion forms very stable complex ions with a variety of metal ions.What is the molar equilibrium concentration of uncomplexed Ni²⁺(aq)in a solution that initially contains 1.3 mol of Ni(CN)₄²− per liter of solution .K_f for Ni(CN)₄²− is .

Accepted Answer

The answer of Cyanide ion forms very stable complex ions...

Question 8

Which of the following is not likely to form a complex ion with Al³⁺?

Accepted Answer

NH₄⁺ is a cation and does not have lone pairs to donate to form a coordinate bond with Al³⁺, unlike the other options which can act as ligands.

Question 9

Calculate the molar concentration of uncomplexed Zn²⁺(aq)in a solution that contains 0.21 mol of Zn(NH₃)₄²⁺ per liter and 0.4986 M NH₃ at equilibrium.K_f for Zn(NH₃)₄²⁺ is .

Accepted Answer

The answer of Calculate the molar concentration of uncomplexed Zn²⁺(aq)in...

Question 10

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

Accepted Answer

The answer of Suppose sodium hydroxide is added to a...

Question 11

Which of the following substances will increase the molar solubility of nickel(II)phosphate in a saturated solution?

Accepted Answer

The answer of Which of the following substances will increase...

Question 12

Suppose hydrogen sulfide is added to a solution that is 0.0010 M in Fe²⁺,Cd²⁺,Co²⁺,and Mn²⁺ such that the concentration of H₂S is 0.10 M.When the pH of the solution is adjusted to 3,a precipitate forms.What is the composition of the precipitate? H₂S(aq)+ 2H₂O(l) 2H₃O⁺(aq)+ S^2-(aq); K_c = 1.1 × 10^-20 Salt K_sp FeS 6)0 × 10^-18 CdS 8)0 × 10^-27 CoS 4)0 × 10^-21 MnS 2)5 × 10^-10

Accepted Answer

The answer of Suppose hydrogen sulfide is added to a...

Question 13

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 .

Accepted Answer

The answer of What is the molar equilibrium concentration of...

Question 14

The figure below represents the results of adding a strong acid to a saturated solution of an ionic compound.Which of the following could be the ionic compound?

Accepted Answer

The answer of The figure below represents the results of...

Question 15

An aqueous solution of Ag(CN)₂− is made by combining 0.0100 moles AgNO₃ with 1.00 mole NaCN and diluting to 1.000 L.What is the molar concentration of Ag⁺ in the solution? Ag⁺(aq)+ 2CN^-(aq) Ag(CN)₂^-(aq); K_f = 5.6 × 10¹⁸

Accepted Answer

The answer of An aqueous solution of Ag(CN)₂− is made...

Question 16

What is the concentration of Cd²⁺ in a 0.012 M Cd(NO₃)2 solution that is also 1.0 M NH₃? For Cd(NH₃)₄²⁺,K_f = 1.0 × 10⁷.

Accepted Answer

The concentration of Cd²⁺ in the solution can be calculated using the solubility product constant (Ksp) for Cd(NH₃)₄²⁺, which is given as 1.0 × 10⁷ (or 1.0 × 10^-17). Given the high concentration of NH4+ (1.0 M), the common ion effect significantly reduces the solubility of CdS in the solution. The calculation involves setting up an expression for Ksp in terms of the concentrations of the ions produced by the dissolution of CdS, and solving for the concentration of Cd2+ ions, which is equal to the solubility of CdS in this context. The correct answer reflects the solubility of CdS under these conditions, taking into account the common ion effect and the given Ksp value.

Question 17

The best explanation for the dissolution of ZnS in dilute HCl is that

Accepted Answer

The dissolution of ZnS in dilute HCl can be explained by the decrease in sulfide ion concentration due to the formation of H2S gas. This shifts the equilibrium to dissolve more ZnS to replace the removed sulfide ions.

Question 18

In which of the following solutions would CaC₂O₄ have the highest molar solubility?

Accepted Answer

CaC2O4 is more soluble in acidic solutions because the oxalate ion (C2O4^2-) can react with H+ ions, reducing its concentration and shifting the equilibrium to dissolve more CaC2O4.

Question 19

Which of the following insoluble salts will dissolve upon reaction with excess ammonia?

Accepted Answer

Silver chloride (AgCl) can dissolve in excess ammonia due to the formation of the complex ion [Ag(NH3)2]+, which increases its solubility.

Question 20

What is the best way to ensure complete precipitation of SnS from a saturated H₂S solution?

Accepted Answer

Adding a strong base will increase the pH, allowing for the complete precipitation of SnS. This is because H₂S is a weak acid and will not completely dissociate, which limits the availability of nucleophilic H₂S- ions needed to form SnS. A strong base will react with H₂S to increase the pH and promote the dissociation of H₂S, leading to complete precipitation of SnS.

Quiz 17: Solubility and Complex-Ion Equilibria

What is the value of the dissociation constant,K_d,for the complex ion Zn(NH₃) ₄²⁺? For Zn(NH₃) ₄²⁺,K_f = 2.9 × 10⁹.

For which of the following salts would the addition of nitric acid increase its solubility?

The figure below represents the results of adding NH₃ to a saturated solution of an ionic compound.Which of the following could the ionic compound be?

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

You have two salts,AgX and AgY,with very similar K_sp values.You know that K_a for HX is much greater than K_a for HY.Which statement will be true?

Cyanide ion forms very stable complex ions with a variety of metal ions.What is the molar equilibrium concentration of uncomplexed Ni²⁺(aq) in a solution that initially contains 1.3 mol of Ni(CN) ₄²− per liter of solution .K_f for Ni(CN) ₄²− is .

Which of the following is not likely to form a complex ion with Al³⁺?

Calculate the molar concentration of uncomplexed Zn²⁺(aq) in a solution that contains 0.21 mol of Zn(NH₃) ₄²⁺ per liter and 0.4986 M NH₃ at equilibrium.K_f for Zn(NH₃) ₄²⁺ is .

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

Which of the following substances will increase the molar solubility of nickel(II) phosphate in a saturated solution?

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 figure below represents the results of adding a strong acid to a saturated solution of an ionic compound.Which of the following could be the ionic compound?

An aqueous solution of Ag(CN) ₂− is made by combining 0.0100 moles AgNO₃ with 1.00 mole NaCN and diluting to 1.000 L.What is the molar concentration of Ag⁺ in the solution? Ag⁺(aq) + 2CN^-(aq) Ag(CN) ₂^-(aq) ; K_f = 5.6 × 10¹⁸

What is the concentration of Cd²⁺ in a 0.012 M Cd(NO₃) 2 solution that is also 1.0 M NH₃? For Cd(NH₃) ₄²⁺,K_f = 1.0 × 10⁷.

The best explanation for the dissolution of ZnS in dilute HCl is that

In which of the following solutions would CaC₂O₄ have the highest molar solubility?

Which of the following insoluble salts will dissolve upon reaction with excess ammonia?

What is the best way to ensure complete precipitation of SnS from a saturated H₂S solution?

Quiz 17: Solubility and Complex-Ion Equilibria

What is the value of the dissociation constant,Kd,for the complex ion Zn(NH3) 42+? For Zn(NH3) 42+,Kf = 2.9 × 109.

For which of the following salts would the addition of nitric acid increase its solubility?

The figure below represents the results of adding NH3 to a saturated solution of an ionic compound.Which of the following could the ionic compound be?

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

You have two salts,AgX and AgY,with very similar Ksp values.You know that Ka for HX is much greater than Ka for HY.Which statement will be true?

Cyanide ion forms very stable complex ions with a variety of metal ions.What is the molar equilibrium concentration of uncomplexed Ni2+(aq) in a solution that initially contains 1.3 mol of Ni(CN) 42− per liter of solution .Kf for Ni(CN) 42− is .

Which of the following is not likely to form a complex ion with Al3+?

Calculate the molar concentration of uncomplexed Zn2+(aq) in a solution that contains 0.21 mol of Zn(NH3) 42+ per liter and 0.4986 M NH3 at equilibrium.Kf for Zn(NH3) 42+ is .

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

Which of the following substances will increase the molar solubility of nickel(II) phosphate in a saturated solution?

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 figure below represents the results of adding a strong acid to a saturated solution of an ionic compound.Which of the following could be the ionic compound?

An aqueous solution of Ag(CN) 2− is made by combining 0.0100 moles AgNO3 with 1.00 mole NaCN and diluting to 1.000 L.What is the molar concentration of Ag+ in the solution? Ag+(aq) + 2CN-(aq) Ag(CN) 2-(aq) ; Kf = 5.6 × 1018

What is the concentration of Cd2+ in a 0.012 M Cd(NO3) 2 solution that is also 1.0 M NH3? For Cd(NH3) 42+,Kf = 1.0 × 107.

The best explanation for the dissolution of ZnS in dilute HCl is that

In which of the following solutions would CaC2O4 have the highest molar solubility?

Which of the following insoluble salts will dissolve upon reaction with excess ammonia?

What is the best way to ensure complete precipitation of SnS from a saturated H2S solution?

What is the value of the dissociation constant,K_d,for the complex ion Zn(NH₃) ₄²⁺? For Zn(NH₃) ₄²⁺,K_f = 2.9 × 10⁹.

The figure below represents the results of adding NH₃ to a saturated solution of an ionic compound.Which of the following could the ionic compound be?

You have two salts,AgX and AgY,with very similar K_sp values.You know that K_a for HX is much greater than K_a for HY.Which statement will be true?

Cyanide ion forms very stable complex ions with a variety of metal ions.What is the molar equilibrium concentration of uncomplexed Ni²⁺(aq) in a solution that initially contains 1.3 mol of Ni(CN) ₄²− per liter of solution .K_f for Ni(CN) ₄²− is .

Which of the following is not likely to form a complex ion with Al³⁺?

Calculate the molar concentration of uncomplexed Zn²⁺(aq) in a solution that contains 0.21 mol of Zn(NH₃) ₄²⁺ per liter and 0.4986 M NH₃ at equilibrium.K_f for Zn(NH₃) ₄²⁺ is .

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 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 .

An aqueous solution of Ag(CN) ₂− is made by combining 0.0100 moles AgNO₃ with 1.00 mole NaCN and diluting to 1.000 L.What is the molar concentration of Ag⁺ in the solution? Ag⁺(aq) + 2CN^-(aq) Ag(CN) ₂^-(aq) ; K_f = 5.6 × 10¹⁸

What is the concentration of Cd²⁺ in a 0.012 M Cd(NO₃) 2 solution that is also 1.0 M NH₃? For Cd(NH₃) ₄²⁺,K_f = 1.0 × 10⁷.

In which of the following solutions would CaC₂O₄ have the highest molar solubility?

What is the best way to ensure complete precipitation of SnS from a saturated H₂S solution?