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What is the pH of saturated solutoin of ...

What is the pH of saturated solutoin of `Cu(OH)_(2)` ?
`(Ksp=3.2xx10^(-20))`

A

6.4

B

7.6

C

7.3

D

7.9

Text Solution

Verified by Experts

The correct Answer is:
B
`{:(Cu(OH)_(2),hArr,Cu^(+2)+,2OH,),(,,s,2s,),(Ksp=4S^(3),,,,):}`
`[{:(2S=[OH^(-)]),(pOH=log[OH^(-)]):}`
`4S^(3)=32xx10^(-21)`
`S^(3)=8xx10^(-21)`
` S=2xx10^(-7)`
`[OH]=25=4xx10^(-7)`
`pOH=7-log_(4)`
pOH=7-0.6=6.4
pH14-6.4=7.6
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