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Precipitating and Dissolving Zinc Hydroxide

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I have zinc hydroxide in solution --- Zn(OH)2 is generally insoluble. My goal is to first render the zinc completely insoluble. We are given a choice of Al2(SO4)3 or H2SO4 in order to lower the pH and solubilize the zinc ---- which is better and why? Then, at a later time, my goal is to render the zinc back to a soluble form and precipitate it? Can this be done with just NaOH or is there an intermediate step in which something like a PO4^-3 ion must be introduced to bond with the zinc first before hydroxide precipitation occurs??

Can you help me understand this process?

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Solution Summary

This solution explains how to precipitate and dissolve zinc hydroxide using various pH's.

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