EXAM 3 CHEM CHAPTER 15 AND 16 QUESTION AND ANSWERS

EXAM 3 CHEM CHAPTER 15 AND 16
QUESTION AND ANSWERS
Which of the following is the correct expression for Ksp for Zn₃(PO₄)₂? - ✔️✔️C.) III



Ksp=[Zn^2+]^3[PO4^3-]^2



What is the solubility of Cd₃(PO₄)₂ in water? (Ksp of Cd₃(PO₄)₂ is 2.5 × 10⁻³³) - ✔️✔️1.2 × 10⁻⁷ M



Adding NaF to a solution of PbF₂ will - ✔️✔️B) decrease the solubility of PbF₂



What is the solubility of PbF₂ in water? (Ksp of PbF₂ is 3.6 × 10⁻⁸) - ✔️✔️2.1 × 10⁻³ M



What is the solubility of MgCO₃ in water? (Ksp of MgCO₃ is 3.5 × 10⁻⁸) - ✔️✔️1.9 × 10⁻⁴ M



The solubility of Ag₂SO₄ in water at 25 °C is 0.0155 M. What is Ksp for Ag₂SO₄? - ✔️✔️1.49 × 10⁻⁵



Ksp = [Ag^+]^2[SO4^2-]

[Ag^+] = 2S

[SO4^2-] = S

Ksp= [2 x 0.0155]^2 [0.0155]

Ksp=1.48955×10^-5



1.49 x 10^-5



What is the solubility of La(IO₃)₃ in water? (Ksp of La(IO₃)₃ is 7.5 × 10⁻¹²) - ✔️✔️7.3 × 10⁻⁴ M

, Ksp=[La^3+] [I03^-]^3

[La^3+] = S

[IO3^-]=3S

Ksp = [S][3S]3

7.5 × 10^-12=[S][27S3]

7.5 × 10^-12=[27S4]

2.777778 × 10^-13 = [S4]

S = 7.25979529116 × 10-4

7.3×10^-4



What is the solubility of PbF₂ in a solution that contains 0.0500 M Pb²⁺ ions? (Ksp of PbF₂ is 3.60 × 10⁻⁸) -
✔️✔️4.24 × 10⁻⁴ M



Ksp=[x][2x]^2

3.60 × 10^-8 = [0.0500][4x^2]

1.80 × 10^-7 = x^2

x= 4.24 × 10^-4



Which of the following would decrease the solubility of a 0.10 M solution of Ag₂CO₃ the most? (Ksp of
Ag₂CO₃ is 8.1 × 10⁻¹²) - ✔️✔️C) adding 0.10 M Ag⁺



What is the solubility of La(IO₃)₃ in a solution that contains 0.100 M IO₃⁻ ions? (Ksp of La(IO₃)₃ is 7.5 ×
10⁻¹²) - ✔️✔️7.5 × 10⁻⁹ M



Ksp= [La^3+][IO3^-]^3

Ksp = [x][0.100]^3