Answer to Question #151028 in General Chemistry for Didiexxxxxxxx

Question

A solution contains 25 mL 0.1 Pb2+ and 25 mL 0.2 M Cu2+, was added with
concentrated Na2CrO4 solution slowly.
Given Ksp PbCr2O4 = 4.8 x 10-12 M2 and Ksp CuC2O4 = 3 x 10-8 M2.
A. Predict which salt will precipitate first.
B. What is the minimum concentration of C2O4- needed to precipitate solution
PbCr2O4?

Answer 1

A) Copper will precipitate first because it is light than lead

B)$C= m/V$

C=0.1/50

C= 0.002g/ml