The maximum pH of a solution which is 0.10 M in Mg ^(2+ )from which Mg (OH) _ 2 is not precipitated is : ( Given K_(sp) " of " Mg (OH)_2 =1.2 xx 10^(-11) M)

The maximum pH of a solution which is 0.10 M in Mg ^(2+ )from which Mg

1.	The maximum pH of a solution which is 0.10 M in Mg ^(2+ )from which Mg (OH) _ 2 is not precipitated is : ( Given K_(sp) " of " Mg (OH)_2 =1.2 xx 10^(-11) M)
Answer» `4. 96` `6.96` `7. 54 ` ` 9. 04` Solution :` Ag_2Cr O_4 HARR 2Ag^(+)+CrO_4^(-2) ` ` "" 2S "" S ` ` (i)0.1 M Ag^(+)" IONS is common ION "` ` 9 xx 10 ^(-12) = ( 2S)^(2)(0.1 )^(2)xx S RARR S =9 xx 10 ^(-10 )M` ` (ii)0.1 M CrO_4^(-2)" ions is commonion " ` ` 9xx 10 ^(_12)=( 2S)^(2)(0.1)rArr 9 xx 10 ^(_12)= 4S^(2)0.1 ` ` S = sqrt( (9)/(4) xx 10 ^(-11))~~4.5 xx 10^(_6)M` `[Mg^(+2) ][OH^(-)] ltKsp , (0.1)[OH^(-) ]^(2)lt 1.2 xx 10 ^(-11)` ` [OH^(-)] lt sqrt(1.2 xx 10 ^(-10)), [OH^(-) ] lt 1.09xx 10 ^(-5)POH = 4. 96 , PH = 9. 04`