Published by:
CGP EDU Academic Team
Published on: August 14, 2026
The salt Al(OH) 3 is involved in the following two equilibria :
Al(OH) 3 (s) 
Al 3+ (aq) + 3OH – (aq) ; K sp
Al(OH) 3 (s) + OH – (aq) 
(aq) ; K C
Which of the following relationship is correct when the solubility is minimum ?
A
[OH – ] = 
B
[OH – ] = 
C
[OH – ] = 
D
None of these
Text Solution
Verified by ExpertsThe correct answer is:
D
Dissolved Al(OH) 3 present in solution as Al 3+ (aq) as well as 
(aq)
∴ S = [Al 3+ (aq)] + [Al(OH) 4 (aq)]
S = 
+ K C [OH – ]
for minimum solubility : 
= 0
or ; – 
+ K C = 0
[OH – ] = 
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