Question 1

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

Accepted Answer

This reaction involves the precipitation of copper sulfide (CuS) from a solution containing sulfide ions (S2-) and cations from Analytical Group II, which includes Cu2+, Pb2+, Cd2+, Hg2 2+. Therefore, the best choice is E, Analytical Group II.

Question 2

What is the molar solubility of zinc hydroxide at pH 12.34? For Zn(OH)₂,K_sp = 2.1 × 10^-16; for Zn(OH)₄^2-,K_f = 2.8 × 10¹⁵.

Accepted Answer

The equilibrium reaction for the dissolution of zinc hydroxide is:

Zn(OH)2(s) ⇌ Zn2+(aq) + 2OH-(aq)

The solubility product constant (Ksp) expression for this reaction is:

Ksp = [Zn2+][OH-]^2

At pH 12.34, the concentration of hydroxide ions can be calculated from the expression for the dissociation constant of water (Kw):

Kw = [H+][OH-] = 1.0 × 10^-14

pH + pOH = 14, so pOH = 14 - 12.34 = 1.66

[OH-] = 10^-pOH = 10^-1.66 = 2.17 × 10^-2 M

Substituting this value and the given Ksp into the Ksp expression:

2.1 × 10^-16 = [Zn2+](2.17 × 10^-2)^2

[Zn2+] = 2.8 × 10^-4 M

This is the molar solubility of zinc hydroxide at pH 12.34, so the best choice is C.

Question 3

What is the effect of substituting soluble metal salts such as NaCl and K₂CO₃ for HCl or (NH₄)₂CO₃ in the qualitative analysis scheme for separating the five Analytical Groups?

Accepted Answer

Substituting NaCl and K₂CO₃ for HCl or (NH₄)₂CO₃ can interfere with the detection of Na⁺ or K⁺ in the original sample, as these ions are already present in the substituted reagents.

Question 4

What will happen if 50.0 mL of 0.032 M Na₂S₂O₃,50.0 mL of 0.010 M AgNO₃,and 50.0 mL of 0.047 M KCl are mixed together? For AgCl,K_sp = 1.8 × 10^-10; for Ag(S₂O₃)₂^3-,K_f = 2.9 × 10¹³.

Accepted Answer

The silver ions will predominantly form the complex Ag(S₂O₃)₂³⁻ due to the high formation constant (Kf), preventing the formation of AgCl precipitate.

Question 5

A _____ is an ion formed from a metal ion with a Lewis base attached to it by a coordinate covalent bond.

Accepted Answer

A complex ion is formed when a Lewis base (also known as a ligand) is attached to a metal ion through a coordinate covalent bond. The resulting species is an ion with multiple components, hence the term "complex."

Question 6

Given the following equilibrium constants, Zn(IO₃)₂ K_sp = Zn(NH₃)₄²⁺K_f = Determine K_c for the dissolution of the sparingly soluble salt Zn(IO₃)₂ in aqueous ammonia (shown below). Zn(IO₃)₂(s)+ 4NH₃(aq) Zn(NH₃)₄²⁺(aq)+ 2IO₃^-(aq)

Accepted Answer

The answer of Given the following equilibrium constants, Zn(IO₃)₂ K_sp =...

Question 7

Determine the molar solubility of AgCl in 3.5 M NH₃.K_spfor AgCl is 1.8 × 10⁻¹⁰and K_ffor Ag(NH₃)₂⁺is 1.7 × 10⁷at 25°C.

Accepted Answer

The answer of Determine the molar solubility of AgCl in...

Question 8

What is the molar solubility of nickel(II)sulfide in 0.091 M KCN? For NiS,K_sp = 3.0 × 10^-19; for Ni(CN)₄^2-,K_f = 1.0 × 10³¹.

Accepted Answer

The answer of What is the molar solubility of nickel(II)sulfide...

Question 9

Given the two equilibria below, Ag(NH₃)₂⁺(aq) Ag⁺(aq)+ 2NH₃(aq); K_d = 5.9 × 10^-8AgI(s) Ag⁺(aq)+ I−(aq); K_sp = What is K_c for the following equilibrium?AgI(s)+ 2NH₃(aq) Ag(NH₃)₂⁺(aq)+ I^-(aq)

Accepted Answer

The answer of Given the two equilibria below, Ag(NH₃)₂⁺(aq) Ag⁺(aq)+ 2NH₃(aq);...

Question 10

The following reaction represents a step in the separation of which analytical group of cations? Hg₂²⁺(aq)+ 2Cl^-(aq)→ Hg₂Cl₂(s)

Accepted Answer

The reaction involves the conversion of mercury sulfide (HgS) to mercury(II) chloride (HgCl2) in the presence of chloride ions, which is characteristic of the separation process for Analytical Group I cations. Group I cations are precipitated and separated as chlorides.

Question 11

In the sulfide scheme for qualitative analysis,the cations of Analytical Group IV are precipitated as phosphates or carbonates.Analytical Group IV consists of

Accepted Answer

Analytical Group IV consists of the alkaline earth elements, which are typically precipitated as phosphates or carbonates in the sulfide scheme for qualitative analysis. The other listed options (B, C, and D) are not part of Analytical Group IV.

Question 12

_____ involves the determination of the identity of the substances present in a mixture.

Accepted Answer

Qualitative analysis involves determining the identity of substances present in a mixture, while gravimetric, quantitative, volumetric, and titrimetric analyses all involve determining the quantity or concentration of substances in a mixture.

Question 13

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

Accepted Answer

A ligand is a molecule or ion that can donate a pair of electrons to a metal ion to form a covalent bond. This results in the formation of a complex ion. Ligands can be neutral molecules such as water or ammonia, or anionic species such as chloride or cyanide.

Question 14

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

The Analytical Group III cations (Fe3+, Al3+, Cr3+) can be separated from the cations of Analytical Groups IV and V (Mn2+, Ni2+, Zn2+, Co2+, Pb2+, Cd2+) by adding HS- in basic solution. This will form insoluble metal sulfides or hydroxides for the Analytical Group III cations, while the cations of Groups IV and V will remain in solution as metal ions. This separation is based on the differing solubility properties of the metal sulfides or hydroxides formed.

Question 15

Consider a solution containing the following cations: Na⁺,Hg²⁺,Mn²⁺,Al³⁺ and Ag⁺.Treatment of the solution with dilute,HCl followed by saturation with H₂S,results in formation of precipitate(s).Which ions still remain in solution (did not precipitate)?

Accepted Answer

The answer of Consider a solution containing the following cations:...

Quiz 17: Solubility and Complex-Ion Equilibria

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 zinc hydroxide at pH 12.34? For Zn(OH) ₂,K_sp = 2.1 × 10^-16; for Zn(OH) ₄^2-,K_f = 2.8 × 10¹⁵.

What is the effect of substituting soluble metal salts such as NaCl and K₂CO₃ for HCl or (NH₄) ₂CO₃ in the qualitative analysis scheme for separating the five Analytical Groups?

What will happen if 50.0 mL of 0.032 M Na₂S₂O₃,50.0 mL of 0.010 M AgNO₃,and 50.0 mL of 0.047 M KCl are mixed together? For AgCl,K_sp = 1.8 × 10^-10; for Ag(S₂O₃) ₂^3-,K_f = 2.9 × 10¹³.

A _____ is an ion formed from a metal ion with a Lewis base attached to it by a coordinate covalent bond.

Given the following equilibrium constants, Zn(IO₃) ₂ K_sp = Zn(NH₃) ₄²⁺K_f = Determine K_c for the dissolution of the sparingly soluble salt Zn(IO₃) ₂ in aqueous ammonia (shown below) . Zn(IO₃) ₂(s) + 4NH₃(aq) Zn(NH₃) ₄²⁺(aq) + 2IO₃^-(aq)

Determine the molar solubility of AgCl in 3.5 M NH₃.K_spfor AgCl is 1.8 × 10⁻¹⁰and K_ffor Ag(NH₃) ₂⁺is 1.7 × 10⁷at 25°C.

What is the molar solubility of nickel(II) sulfide in 0.091 M KCN? For NiS,K_sp = 3.0 × 10^-19; for Ni(CN) ₄^2-,K_f = 1.0 × 10³¹.

Given the two equilibria below, Ag(NH₃) ₂⁺(aq) Ag⁺(aq) + 2NH₃(aq) ; K_d = 5.9 × 10^-8AgI(s) Ag⁺(aq) + I−(aq) ; K_sp = What is K_c for the following equilibrium?AgI(s) + 2NH₃(aq) Ag(NH₃) ₂⁺(aq) + I^-(aq)

The following reaction represents a step in the separation of which analytical group of cations? Hg₂²⁺(aq) + 2Cl^-(aq) → Hg₂Cl₂(s)

In the sulfide scheme for qualitative analysis,the cations of Analytical Group IV are precipitated as phosphates or carbonates.Analytical Group IV consists of

_____ involves the determination of the identity of the substances present in a mixture.

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

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?

Consider a solution containing the following cations: Na⁺,Hg²⁺,Mn²⁺,Al³⁺ and Ag⁺.Treatment of the solution with dilute,HCl followed by saturation with H₂S,results in formation of precipitate(s) .Which ions still remain in solution (did not precipitate) ?

Quiz 17: Solubility and Complex-Ion Equilibria

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

What is the molar solubility of zinc hydroxide at pH 12.34? For Zn(OH) 2,Ksp = 2.1 × 10-16; for Zn(OH) 42-,Kf = 2.8 × 1015.

What is the effect of substituting soluble metal salts such as NaCl and K2CO3 for HCl or (NH4) 2CO3 in the qualitative analysis scheme for separating the five Analytical Groups?

What will happen if 50.0 mL of 0.032 M Na2S2O3,50.0 mL of 0.010 M AgNO3,and 50.0 mL of 0.047 M KCl are mixed together? For AgCl,Ksp = 1.8 × 10-10; for Ag(S2O3) 23-,Kf = 2.9 × 1013.

A _____ is an ion formed from a metal ion with a Lewis base attached to it by a coordinate covalent bond.

Given the following equilibrium constants, ​ Zn(IO3) 2 Ksp = Zn(NH3) 42+ Kf = ​ Determine Kc for the dissolution of the sparingly soluble salt Zn(IO3) 2 in aqueous ammonia (shown below) . Zn(IO3) 2(s) + 4NH3(aq) Zn(NH3) 42+(aq) + 2IO3-(aq)

Determine the molar solubility of AgCl in 3.5 M NH3.Ksp for AgCl is 1.8 × 10−10 and Kf for Ag(NH3) 2+ is 1.7 × 107 at 25°C.

What is the molar solubility of nickel(II) sulfide in 0.091 M KCN? For NiS,Ksp = 3.0 × 10-19; for Ni(CN) 42-,Kf = 1.0 × 1031.

Given the two equilibria below, Ag(NH3) 2+(aq) Ag+(aq) + 2NH3(aq) ; Kd = 5.9 × 10-8AgI(s) Ag+(aq) + I−(aq) ; Ksp = What is Kc for the following equilibrium?AgI(s) + 2NH3(aq) Ag(NH3) 2+(aq) + I-(aq)

The following reaction represents a step in the separation of which analytical group of cations? Hg22+(aq) + 2Cl-(aq) → Hg2Cl2(s)

In the sulfide scheme for qualitative analysis,the cations of Analytical Group IV are precipitated as phosphates or carbonates.Analytical Group IV consists of

_____ involves the determination of the identity of the substances present in a mixture.

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

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?

Consider a solution containing the following cations: Na+,Hg2+,Mn2+,Al3+ and Ag+.Treatment of the solution with dilute,HCl followed by saturation with H2S,results in formation of precipitate(s) .Which ions still remain in solution (did not precipitate) ?

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 zinc hydroxide at pH 12.34? For Zn(OH) ₂,K_sp = 2.1 × 10^-16; for Zn(OH) ₄^2-,K_f = 2.8 × 10¹⁵.

What is the effect of substituting soluble metal salts such as NaCl and K₂CO₃ for HCl or (NH₄) ₂CO₃ in the qualitative analysis scheme for separating the five Analytical Groups?

What will happen if 50.0 mL of 0.032 M Na₂S₂O₃,50.0 mL of 0.010 M AgNO₃,and 50.0 mL of 0.047 M KCl are mixed together? For AgCl,K_sp = 1.8 × 10^-10; for Ag(S₂O₃) ₂^3-,K_f = 2.9 × 10¹³.

Given the following equilibrium constants, Zn(IO₃) ₂ K_sp = Zn(NH₃) ₄²⁺K_f = Determine K_c for the dissolution of the sparingly soluble salt Zn(IO₃) ₂ in aqueous ammonia (shown below) . Zn(IO₃) ₂(s) + 4NH₃(aq) Zn(NH₃) ₄²⁺(aq) + 2IO₃^-(aq)

Determine the molar solubility of AgCl in 3.5 M NH₃.K_spfor AgCl is 1.8 × 10⁻¹⁰and K_ffor Ag(NH₃) ₂⁺is 1.7 × 10⁷at 25°C.

What is the molar solubility of nickel(II) sulfide in 0.091 M KCN? For NiS,K_sp = 3.0 × 10^-19; for Ni(CN) ₄^2-,K_f = 1.0 × 10³¹.

Given the two equilibria below, Ag(NH₃) ₂⁺(aq) Ag⁺(aq) + 2NH₃(aq) ; K_d = 5.9 × 10^-8AgI(s) Ag⁺(aq) + I−(aq) ; K_sp = What is K_c for the following equilibrium?AgI(s) + 2NH₃(aq) Ag(NH₃) ₂⁺(aq) + I^-(aq)

The following reaction represents a step in the separation of which analytical group of cations? Hg₂²⁺(aq) + 2Cl^-(aq) → Hg₂Cl₂(s)

Consider a solution containing the following cations: Na⁺,Hg²⁺,Mn²⁺,Al³⁺ and Ag⁺.Treatment of the solution with dilute,HCl followed by saturation with H₂S,results in formation of precipitate(s) .Which ions still remain in solution (did not precipitate) ?