Which of the following solution will have pH = 13 on assuming complete

1.	Which of the following solution will have pH = 13 on assuming complete dissociation
Answer» 100 ml of solution of 0.1 N` Mg (OH)_2` 0. 56 g of KOH in 100 ml solution 4 g of NaOH in 500 ml solution 100 ml of solution of 0.05 M Mg ` (OH)_2` Solution :(a) ` [OH^(-) ] =0.1 N ,pOH= 1 rArrpH =13` (b) `n= ( 0. 56)/(56) rArr M= ( 0.01)/( 0.1 ) =0.1` `rArr POH =1 rArr pH = 13` ( c ) ` n= 4 //40 =0.1 rArr M =(0.1)/( 0.5)=0.2` `rArr p = 14 - 1 log 2 =13.3` (d) `[OH^(-)] =2 xx 0.05 = 0.1 ` `pOH =1 rArr pH =13` ` NH_3 +H_2OhArr NH_4OH HARR NH_4^(+)+OH^(-) ` ` C_1(1-alpha _1)C_1alpha _1 =C_2 ` `"" C_2( 1-alpha_2)C_2alpha _2 = C_3`

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