Lesson 20 1 Lesson 20 Example 1 Ammonium hexachloroplatinate, (NH4)2(PtCl6) has a Kspof 5.6 ×10–6mol3/L3at 20 oC. Compute its solubility in g/L of solution.Lesson 20 The common ion effect Lesson 20 (a) A clear saturated solution of PbI2(b) When KI is added, the common ion I-makes part of the Pb2I precipitate (yellow precipitate)
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Lesson 20 2 Lesson 20 Common ion effect Ag+, Cl-AgClAg+, Cl-,Na+AgCl+NaClKsp= [Ag+][Cl-][Cl-] increases momentarilyQ = [Ag+][Cl-] > KspAg+, Cl-,Na+AgClAgCl precipitates torestore [Ag+][Cl-] toits equilibrium value, KspLesson 20 Example 2 Calculate the mass of AgCl that can dissolve