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-----At What pH is Zn(OH)2 Completely Dissolved in Water?
I am master student of Chemical engineering, I want to know, at what pH value Zn(OH)2 completely dissolved in the water.
Thank
student - Tainan, Taiwan
September 5, 2008
Hi, Nanik. There are usually no simple and definitive answers to such questions. The solubility curve for zinc vs. pH is basically parabolic though, with a minimum at about a pH of 10.3-10.5, so you need to go well above that. Obviously you can "completely dissolve" a very small amount in a very large amount of water even at 10.3-10.5, and you cannot "completely dissolve" a large amount in a very small quantity of water at any pH.
Can you please tell us what the background question is that motivates this subquestion? Thanks
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September 18, 2008
... or you need to go to a much lower pH. At the high pH it will give zincate, at the low pH it will give a straight zinc salt (which salt depends on which acid is used to give the low pH).
Bill Reynolds [deceased]
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September 18, 2008
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