Solubility Product Constant (Ksp) and Formation Constant (Kf)

A solution has a [Ca2+] of 0.00350 M. What concentration of hydroxide is needed before precipitation begins? Ksp of Ca(OH)2 = 4.68 × 10-6

0.0366 M

A solution has a [Pb2+] of 0.00105 M. What concentration of chloride is needed before precipitation begins? Ksp of PbCl2 = 1.17 × 10-5

0.106 M

Which of the following is the correct solubility product constant for the reaction shown below? SrCO3(s) ⇌ Sr2+(aq) + CO32−(aq)

Ksp = [Sr2+][CO32−]

Which of the following is the correct solubility product constant for the following reaction? Zn(OH)2(s) ⇌ Zn2+(aq) + 2 OH−(aq)

Ksp = [Zn2+][OH−]2

What equation best represents the behavior of solid Mg(OH)2 when added to water?

Mg(OH)2(s) ⇌ Mg2+(aq) + 2 OH−(aq)

What is the molar solubility of Ca(OH)2 if the Ksp is 6.5 × 10-6? Ca(OH)2(s) ⇌ Ca2+(aq) + 2 OH−(aq)

1.2 × 10-2 M

What is the molar solubility of AgCl if the Ksp is 1.8 × 10-10? AgCl(s) ⇌ Ag+(aq) + Cl−(aq)

1.3 × 10-5 M

A solution has [Ag+] of 3.2 × 10-3 M and 0.125 M NH3. What is the concentration of Ag+ after the solution reaches equilibrium? Kf of Ag(NH3)2+ = 1.7 × 107

1.3 × 10-8 M

What is the molar solubility of Cr(OH)3 if the Ksp is 1.6 × 10-30? Cr(OH)3(s) ⇌ Cr3+(aq) + 3 OH−(aq)

1.6 x 10-8 M

What is the molar solubility of NiS if the Ksp is 3.0 × 10-20? NiS(s) ⇌ Ni2+(aq) + S2−(aq)

1.7 × 10-10 M

What concentration of hydroxide is needed to begin formation of Pb(OH)2 in a solution with [Pb2+] is 4.5 × 10-5 M? Kf of Pb(OH)2 = 8.0 × 1013

1.7 × 10-5 M

A solution has [Fe2+] of 0.0200 M. What concentration of sulfide is needed before precipitation begins? Ksp of FeS = 3.72 × 10-10

1.86 × 10-8 M

A solution has [Ag+] of 2.9 × 10-4 M and 0.225 M of (S2O3)2−. What is the concentration of Ag+ after the solution reaches equilibrium? Kf of Ag(S2O3)23−. = 2.9 × 1013

2.0 × 10-16 M

What concentration of Cu2+ is needed to have a concentration of Cu(CN)42- equal to 2.0 × 10-5 M in a solution with [CN−] is 9.3 × 10-4 M? Kf of Cu(CN)42- = 1.0 × 1025

2.7 × 10-18 M

A solution has a [Ag+] of 0.00175 M. What concentration of chromate is needed before precipitation begins? Ksp of Ag2CrO4 = 1.12 × 10-12

3.66 × 10-7 M

A solution has [Zn2+] of 8.9 × 10-4 M and 0.100 M NH3. What is the concentration of Zn2+ after the solution reaches equilibrium? Kf of Zn(NH3)42+ = 2.8 × 109

3.7 × 10-9 M

Which equation best represents the formation of AlF63-?

Al3+(aq) + 6 F−(aq) ⇌ AlF63-(aq)

What equation best represents the behavior of BaSO4 in water?

BaSO4(s) ⇌ Ba2+(aq) + SO42−(aq)

Which equation best represents the formation of Fe(CN)63-?

Fe3+(aq) + 6 CN−(aq) ⇌ Fe(CN)63−(aq)

What is the Ksp for the following reaction, if the concentration of Ba2+ was measured to be 0.0075 M and F− was measured to be 0.015 M? BaF2(s) ⇌ Ba2+(aq) + 2 F−(aq)

Ksp = 1.7 × 10-6

What is the Ksp for the following reaction if the concentration of La3+ was measured to be 0.0013 M and F− was measured to be 5.36 × 10-6 M? LaF3(s) ⇌ La3+(aq) + 3 F−(aq)

Ksp = 2.0 × 10-19

What is the Ksp for the following reaction, if the concentrations of Ca2+ and SO42− were both measured to be 0.0048 M? CaSO4(s) ⇌ Ca2+(aq) + SO42−(aq)

Ksp = 2.3 × 10-5

What is the Ksp for the following reaction if the concentration of Ca2+ and SO42- were both measured to be 4.89 × 10-3 M? CaSO4(s) ⇌ Ca2+(aq) + SO42−(aq)

Ksp = 2.39 × 10-5

What is the Ksp for the following reaction if the concentration of Pb2+ was measured to be 0.0043 M and F− was measured to be 0.0029 M? PbF2(s) ⇌ Pb2+(aq) + 2 F−(aq)

Ksp = 3.6 × 10-8

What is the Ksp for the following reaction, if the concentration of Fe2+ was measured to be 5.8 x 10-6 M and OH− was measured to be 1.16 x 10-5 M? Fe(OH)2(s) ⇌ Fe2+(aq) + 2 OH−(aq)

Ksp = 7.8 × 10-16

Which of the following is the correct solubility product constant for the following reaction? Ag2CrO4(s) ⇌ 2 Ag+(aq) + CrO42−(aq)

Ksp = [Ag+]2[CrO42−]

Which of the following is the correct solubility product constant for the following reaction? Ca3(PO4)2(s) ⇌ 3 Ca2+(aq) + 2 PO43−(aq)

Ksp = [Ca2+]3[PO43−]2

Which of the following is the correct solubility product constant for the reaction shown below? CaF2(s) ⇌ Ca2+(aq) + 2 F−(aq)

Ksp = [Ca2+][F−]2

Which of the following is the correct solubility product constant for the reaction shown below? Cu3(PO4)2(s) ⇌ 3 Cu2+(aq) + 2 PO43−(aq)

Ksp = [Cu2+]3[PO43−]2

What equation best represents the behavior of PbSO4 in water?

PbSO4(s) ⇌ Pb2+(aq) + SO42−(aq)