The solubility products of Al(OH)3 and Zn(OH)2 are 8.5 × 10–23 and 1.8 × 10–14 respectively. If NH4OH is added to a solution containing Al3+ and Zn2+ ions, then substance precipitated first is:
(a) Al(OH)3
(b) Zn(OH)2
(c) Both together
(d) None at all.
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the substance precipitated first is Al( OH)3. Explanation: Al(OH)3=Al3++3OH− Kps=[Al3+]× [OH−]3=8.5×10−23 if you suppose [Al3+]=10−2
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