5. To 50 ml of a solution containing 5.6 g/l Fe3+ and 52 mg/l Cr3+, add 50 ml of 0.1 mol/l NaOH solution. Find the residual concentration of iron in the solution after precipitation of the hydroxide. What part of the iron was deposited? What is the degree of chromium coprecipitation?
(PR (Cr(OH)3) = 7.9•10-21, PR(Fe(OH)3) = 1•10-17)
Answer: R(Fe3+)=33.2%; R(Cr3+)=99.84%; C(Fe3+)w.f.=1.87 g/l)
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