Answer to Question #211959 in Chemistry for cayyy

Question

Briefly explain why sparingly soluble product must be removed by filtration before back titration.

Answer 1

Let's provide an example to answer this question.

Since the silver chloride precipitate is sparingly soluble, it dissolves some extent to give silver ion back to the solution. So that excess of thiocyanate ion is consumed during the second titration. Hence, the sparingly soluble silver chloride must be removed before the titration of excess silver ion.