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K(sp) of Mg(OH)(2) is 4.0xx10^(-6). At w...

`K_(sp)` of `Mg(OH)_(2)` is `4.0xx10^(-6)`. At what minimum `pH, Mg^(2+)` ions starts precipitating `0.01 MgCl`

A

(a)`2+ log2`

B

(b)`2- log 2`

C

(c )`12+ log 2`

D

(d)`12- log 2`

Text Solution

Verified by Experts

The correct Answer is:
C
Precipitation starts when `Q_(sp)= K_(sp)`.
`K_(sp)=[Ca^(2+)][overset(Theta)OH]^(2)`
`:. [overset(Theta)OH]=((4xx10^(-6))/0.01)^(1//2)=2xx10^(-2)`
`pOH= -log 2+2`
`pH=14-[- log 2+2] =12+log 2`.
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