Prelaboratory AssignmentDetermining the Solubility Product o

Prelaboratory Assignment:Determining the Solubility Product of Pbl, 1. Silver nitrate is added to a solution of 1 x 10 M sodium acetate (KpAgCH,,1.9 x 10: \"): a) At what concentration of Ag does a precipitate start to form? b) What is the concentration of acetate ion in solution if [Ag+] = 0.500M?

Solution

concentration of sodium acetate = 1x10^-2M

Ksp = 1.9x10^-3

AgNO3(aq) + CH3COONa(aq) ------------------ AgCOOCH3(s) + NaNO3(aq)

AgCOOCH3 ---------------- Ag+ + CH3COO-

Ksp = [Ag+][CH3COO-]

1.9x10^-3 = [Ag+] x 1x10^-2

[Ag+] = 1.9x10^-3/1x10^-2 = 1.9x10^-1 = 0.19M

[Ag+] = 0.19M

b)

Ksp = [Ag+][CH3COO-]

1.9x10^-3= 0.500 x [CH3COO-]

[CH3COO-] = 3.8x10^-3M