2. Calculate what amount of 0.1 mol/l NaOH solution must be added to 200 ml of a solution containing 0.28 g/l Fe3+ and 5•10-5 g/l La3+ in order to precipitate 50% of iron in the form of hydroxide. What will be the degree of coprecipitation of lanthanum? PR (La(OH)3)=6.5•10-20; PR(Fe(OH)3)=1•10-17.
Answer: V(NaOH)=15 ml; D=153.8; R=99.4%

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