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Question

What is the solubility of Al(OH)3, (Ksp=1×1033) in a buffer solution of pH=4 ?

A
103 M
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B
106 M
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C
104 M
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D
1010 M
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Solution

The correct option is A 103 M
pH=4[H+]=104M[OH]=1010M
Al(OH)3Al+3+3OH
Ksp(Al(OH)3)=S×S3
Ksp(Al(OH)3)=[Al+3][OH]3
[Al3+][OH]3=1×1033
[Al3+](1010)3=1×1033[Al+3]=103 M

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