The solubility of Ba_3(AsO_4)_2(formula weight=690 )is 6.9 xx 10^(-2)g//100 ml. what is the K_(sp)?

The solubility of Ba_3(AsO_4)_2(formula weight=690 )is 6.9 xx 10^(-2)g

1.	The solubility of Ba_3(AsO_4)_2(formula weight=690 )is 6.9 xx 10^(-2)g//100 ml. what is the K_(sp)?
Answer» `1.08 xx 10^(-11)` ` 1.08 xx 10^(-13)` ` 1.0 xx 10^(-15)` ` 6.0 xx 10^(-13)` Solution :`S= 6.9 xx 10^(-2)gm // 100ml ` ` =(6.9xx10 ^(-2))/( 690 )mol //100 ML ` ` = 10 ^(-4)" mole " //100ml ` `therefore 100ml -10 ^(-4)"mole " ` ` 100 ml -10 ^(-4)" mole " ` `rArr 10 ^(-3)" moles" rArr K_(Sp) =108 S^(5) `