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Question
The solubility of Al(OH)3 and Zn(OH)2 are 
and 1.8 × 10-14, respectively. If NH4OH is added to a solution containing Al3+ and Zn2+ ions, then substance precipitated first is
and 1.8 × 10-14, respectively. If NH4OH is added to a solution containing Al3+ and Zn2+ ions, then substance precipitated first is Options
A.Al(OH)3
B.Zn(OH)2
C.Both (a) and (b)
D.None of these
Solution
(Assume [Al3+] = [Zn2+])
The compound which have less Ksp value will be precipitated first. Since the Ksp of Al(OH)3 is less than Ksp of Zn(OH)2, So former is precipitated.
[OH-]min for Al3+ =
[OH-]min for Al2+ =
The compound which have less Ksp value will be precipitated first. Since the Ksp of Al(OH)3 is less than Ksp of Zn(OH)2, So former is precipitated.
[OH-]min for Al3+ =
[OH-]min for Al2+ =
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