15. Determine at what pH it is advisable to precipitate Ni2 and Cu2 in the form of hydroxides from a solution containing 1.6 g•l-1 CuSO4 and 3.1 g•l-1 NiSO4. PR (Cu (OH) 2) \u003d 5.6 ∙ 10-20. PR(Ni(OH)2) = 1.0∙10-15.

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