79. Solving a chemistry problem

79. Solving a chemistry problem

1. How many grams of NH4Cl must be added to 20 ml of a solution containing 2×10–3M FeSO4 and 5×10–2M NH4OH in order to form a precipitate of Fe(OH)2?
PR(Fe(OH)2)=4.8*10–16, K(NH4OH)=1.8*10–5.

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