solubility

JEE Mains 2015 Sample Questions › Physical Chemistry questions › solubility

The solublity product constant for Co(OH)₃ is 1.6*10^-44.What is the solublity of Co(OH)₃ in a soluiton buffered at pH=8

#Chemistry #Physical Chemistry

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5 Answers

1

Kumar Saurabh ·2008-11-01 14:49:20

Co(OH)₃ [eq] Co³⁺+3OH^-

let the solubility be S

[Co³⁺]=S

As the solution is buffered and pH=8
so [OH^-]10^-6

Ksp=[Co³⁺][OH^-]³=S(10^-6)³

implies S=1.6*10^-44/10^-18 = 1.6*10^-24

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24

eureka123 ·2008-11-03 10:49:27

sorry yaar.....answer is 1.6*10^-26...........hope u can find the mistake and correct it............

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62

Lokesh Verma ·2008-11-03 10:59:11

dude there is just that slight mistake..

see the reply properly kumar has made a slight mistake in the last step :)

I hope u are reading the solutions as well and not just the final answer [3]

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1

voldy ·2008-11-03 11:01:11

I think , eureka looked only at the powers.

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24

eureka123 ·2008-11-04 10:29:52

not like that..............coincidently i was also making mistake in final step............

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