Soluble Salts in Water. KI and K 2 CrO 4 : Potassium iodide and potassium chromate are water-soluble. AgI and PbCrO 4 Silver iodide and lead chromate and are sparingly soluble: K sp (AgI)=8.5 X 10 -17 K sp (PbCrO 4 )=1.8 X 10 -14.
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Silver iodide AgI(s) Ag+ + I- Ksp=[Ag+][I-] = 8.5 X 10-17 [Ag+] = [I-] = solubility =
What if the solution were 0.1M in Ag+ ions?
What if the solution were 0.1M in I- ions?Common Ion Effect
Lead chromate PbCrO4(s) Pb2+ + CrO42- Ksp=[Pb2+][CrO42-] =1.8 X 10-14 Let x = solubility of [Pb2+] = [CrO42-]
What if [Pb2+] = 0.1M?
What if [CrO42-] = 0.1M?
What if [Pb2+]=[CrO42-] = 0.1M?Common Ion Effect
Calcium fluoride CaF2(s) Ca2+(aq) + 2F-(aq) Ksp=[Ca2+][2F-]2 = 1.7 X 10-10 Solubility = x = [Ca2+] = 5.6 X 10-4 Ksp=[Ca2+] [2F-]2 = (x)(2x)2 = 4x3= 1.7 X 10-10Common Ion Effect
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