Selective ion precipitation can be used to separate cations that form insoluble complexes with almost any...

Selective ion precipitation can be used to separate cations that form insoluble complexes with almost any ion as long as the difference in K_sp values is at least 3 powers of 10. We have seen how this works for sulfide precipitates, but this can work for almost any ion. The next problem explores the separation of metal hydroxides.

You are given a solution that is 0.066 in Pb²⁺ and 0.054 in Co²⁺ that you wish to separate using selective ion precipitation with OH^- ions. The Ksp value for Pb(OH)₂ = 1.43 X 10^-20 and the Ksp value for Co(OH)₂ = 5.92 X 10^-15.

a) What is the threshold pH, below which you get precipitation of the least soluble metal hydroxide while the most soluble one remains in solution?

b) Assume you are at the pH threshold that you calculated in part b. What is the molar concentration of Pb²⁺cation that remains in solution at this pH?

Expert Solution

queen_honey_blossom answered 2 years ago

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