Deck 10: Solubility and Precipitation Equilibria

Question 1

Calculate the pH at equilibrium in a solution that is initially 0.15 M Cu²⁺ and 0.50 M OH^-.

A) 13.00
B) 9.56
C) 11.56
D) 12.04
E) none of the above

Answer 1

9.56

Question 2

pertain to calcium phosphate which has a molar solubility of 1.6´10^-7 at 25°C.


-Refer to Exhibit 16-1. Which of the following is the correct solubility product expression for the dissolution of calcium phosphate in water

A) [Ca²⁺][PO₄^3-]
B) [3Ca²⁺][2PO₄^3-]
C) [Ca²⁺]²[PO₄^3-]³
D) [2Ca²⁺]₂[3PO₄^3-]³
E) none of the above

Answer 2

none of the above

Question 3

pertain to calcium phosphate which has a molar solubility of 1.6´10^-7 at 25°C.

-Refer to Exhibit 16-1. What is the value of K_sp for calcium phosphate in water at 25°C?

A) 1.1´10^-32
B) 8.0´10^-31
C) 1.8´10^-39
D) 1.3´10^-38

Answer 3

1.1´10^-32

Question 4

pertain to calcium phosphate which has a molar solubility of 1.6´10^-7 at 25°C.

-Refer to Exhibit 16-1. In acidic solution the value of K_sp for calcium phosphate at °C will?

A) increase
B) decrease
C) stay the same

Question 5

pertain to calcium phosphate which has a molar solubility of 1.6´10^-7 at 25°C.

-Refer to Exhibit 16-1. In acidic solution, the molar solubility of calcium phosphate at 25°C will

A) increase
B) decrease
C) stay the same

Question 6

What is the solubility of Al(OH)₃ in a buffer solution with a pH of 10.00 at 25°C? K_sp for Al(OH)₃ is 3.7 x 10^-15.

A) 6.6 mg^.L^-1
B) 8.4 mg^.L^-1
C) 19 mg^.L^-1
D) 290 mg^.L^-1
E) None of the above