What is the maximum concentration of Mg^(+2)that can be introduced into a solution containing0.1 M NH_3 and 0.01 M NH_4^(+ )without causing precipitation of Mg (OH)_2 ?K_b of NH_3 = 10^(6)K_(sp)of Mg(OH)_2 =1.2 xx 10^(-12)

What is the maximum concentration of Mg^(+2)that can be introduced int

1.	What is the maximum concentration of Mg^(+2)that can be introduced into a solution containing0.1 M NH_3 and 0.01 M NH_4^(+ )without causing precipitation of Mg (OH)_2 ?K_b of NH_3 = 10^(6)K_(sp)of Mg(OH)_2 =1.2 xx 10^(-12)
Answer» ` 0.012 M` ` 0.24 M` ` 0.024 M` ` 0.048 M` Solution :no Mg ` OH)_2 ` PPT `rArr IPlt KSP rArr [Mg^(+2) ] [OH^(-)] ^(2) LT 1.2 XX 10 ^(_12) ` ` [OH^(-) ] =(K_bxx [NH_3])/([NH_4^(+) ])=(10 ^(-6)xx 0.1)/( 0.01)= 10 ^(-5) ` ` rArr [Mg^(+2) ] lt(1.2xx 10 ^(-12))/( 10 ^(-10) )= 1.2 xx 10^(-2) `