ionic

How much solid Na2S2O3 should be added to 1.0 L of water so that 0.0005 mol Cd (OH2) could just barely dissolve?K1 and K2 for S2O3-- complexation with Cd++ are 8.3 × 10^3 and 2.5 × 10^2, respectively. Ksp (Cd(OH)2 = 4.5 × 10–15

ques in case photo is not clear