Arkansas State University
Department of Chemistry
and Physics
Answers
Equilibria 2

1. Complete the equilibrium and write the Ksp expression for each of the following:
 
a) AgCl (s)
Ag+ (aq) + Cl- (aq) Ksp = [Ag+][Cl-]
b) Ag2CO3 (s)
2 Ag+ (aq) + CO32- (aq) Ksp = [Ag+]2[CO32-]
c) Sr3(PO4)2 (s)
3 Sr+2(aq) + 2 PO43-(aq) Ksp = [Sr+2]3[PO43-]2

2.  Given the Ksp = 3.0 x 10-14 for MnS, determine if a precipitate will occur from mixing 0.8 L of 0.002 M Na2S solution with 0.5 L 0.012 M Mn(NO3)2 solution.

3. Determine the molar solubility of CuS. Ksp = 6.0 x 10-37
4. Determine the Ksp for PbI2 if the molar solubility is 1.52 x 10-3 M.
5. Calculate the solubility (g/L) of AgI in 0.06 M AgNO3.   Ksp = 8.3 x 10-17
6. Tell if the following compounds are soluble (S) or insoluble (I)

Al(OH)3   ___I____  CuNO3  __S_____  (NH4)3PO4 ___S____

CdS ___I____   AgI ___I____