Effect of pH on the Solubility of Zn(OH)2 2009

Effect of pH on the Solubility of Zn(OH)2 2009 - The Effect...

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The Effect of pH on the Solubility of Zn(OH) 2 Some solids that are only weakly soluble in pure water become much more soluble in an acidic solution (pH < 7). An obvious example are compounds that produce OH - ions when dissolved, such as metal hydroxides. Consider Zn(OH) 2 (s), which undergoes: Zn(OH) 2 (s) Zn 2+ (aq) + 2 OH - (aq) K sp = [Zn 2+ ] [OH - ] 2 We have already seen that in increase in the [H 3 O + ] concentration reduces the [OH - ], since K w = [H 3 O + ][OH - ]. Thus, in order to maintain the solubility product K sp , the concentration of [Zn 2+ ] must increase, leading to the increased solubility of the solid. We can calculate this easily. Example : (1) What is the solubility of Zn(OH) 2 in pure water? K sp = 4.5 x 10 -17 (2) What is the solubility of Zn(OH) 2 in a solution buffered at pH=6.00? Solution : (1) Set up an ICE table, and solve for the solubility (x) of Zn(OH) 2 (s). Zn(OH)
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Effect of pH on the Solubility of Zn(OH)2 2009 - The Effect...

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