A sample of hard water contains 0.005 moles of calcium chloride per litre.What is the minimum concentration of sodium sulphate which must be added for removing theCa^(2+)ions from this water sample ?K_(sp) " of "CaSO_4= 2.4 xx 10^(-5)

A sample of hard water contains 0.005 moles of calcium chloride per li

1.	A sample of hard water contains 0.005 moles of calcium chloride per litre.What is the minimum concentration of sodium sulphate which must be added for removing theCa^(2+)ions from this water sample ?K_(sp) " of "CaSO_4= 2.4 xx 10^(-5)
Answer» `4.8 xx 10^(-2)` ` 4.8 xx 10^(-3)` ` 2.4 xx 10^(-2)` ` 2.4 xx 10^(-3)` Solution :`[CA^(+2)]= 5 xx 10 ^(-3)M` From`K_(SP)" of "CaSO_4` ` 2.4 xx 10 ^(-5)= 5 xx 10^(-3)xx [SO_4 ^(-2) ]` ` [SO_4^(-2)]= 4.8 xx 10 ^(-3)MZ` ` [Na_2 SO_4 ] =4.8 xx 10^(-3)M`