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Sparingly soluble salts maintains their ...

Sparingly soluble salts maintains their solubility product value in their saturated solutions irrespective of the sources of the ions .
What is the solubility of `MgCl_2 (gm// L) ` in a 0.01 M KOH solution without causing precipitation of `Mg(OH)_2` ?
` K_(sp) " of " Mg (OH)_2 = 2xx 10^(8) `

A

`1.9 xx 10^(-2) `

B

` 2.8 xx 10^(-3) `

C

` 3.4 xx 10^(-1) `

D

` 4.6 xx 10^(-4) `

Text Solution

Verified by Experts

The correct Answer is:
A
` [KOH ]= 0.01 M , [OH^(-) ] =0.01 M `
` K_(sp) =[Mg^(+2) ] [OH^(-) ]^(2) , 2 xx10 ^(-8) =[Mg^(+2) ](10 ^(-2) )^(2) `
` [Mg^(+2) ] =2 xx 10 ^(-4) " mol"//"lt" `
` [MgCl _2] =2 xx 10 ^(-4) M= 2 xx 10 ^(-4) xx 95 gm //lit `
` " " = 1.9 xx 10 ^(-2) gm//lit `
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