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What is the minimum pH necessary to caus...

What is the minimum pH necessary to cause a precipitate of `Pb(OH)_(2)` `(K_(sp)=1.2xx10^(-5))` to form in a 0.12 M `PbCl_(2)` solution?

A

12.4

B

10.8

C

12

D

11.1

Text Solution

Verified by Experts

The correct Answer is:
C
`K_(sp)=[Pb^(++)][OH^(-)](2)`
`1.2 xx 10^(-5)=0.12[OH^(-)]^(2)`
`10^(-4)=[OH^(-)]^(2)`
`10^(-2)=[OH]^(-)`
` 2=pOH`
`14-2=pH`
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