136. Solving a chemistry problem
21. Calculate the molar concentration of potassium cyanide, which must be created in a solution of 0.001 M (NH4) 2 [Cu (CN) 4], so that CuS does not precipitate in the presence of sulfide ions with a concentration of 10-5 mol / l in this solution
K nest [Cu(CN)4]2-=4.9*10-31
PR(CuS)=4*10-38
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