21. Neutralized wastewater contains 1 mg•l-1 CuSO4 and 2 mg•l-1 NiSO4, as well as 1 g•l-1 H2SO4. The suspension used for neutralization contains 5% Ca(OH)2. Wastewater consumption 100 m3•day-1. Determine the mass of required Ca(OH)2 and the mass of precipitate formed per day.

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