$AB_2 $ is 10% dissociated in water to $A^{2+}$ and $B^-$. The boiling point of a 10.0 molal aqueous solution of $AB_2 $ is _ _ _ _ $^ \circ C $. (Round off to the nearest integer)
[Given: Molal elevation constant of water $K_b = 0.5 K.Kg.mol^{-1} $, boiling point of pure water = $100 ^\circ C $] Continue reading $AB_2 $ is 10% dissociated in water to $A^{2+}$ and $B^-$ ….
80 g of copper sulphate $CuSO_4 .5H_2 O $ is dissolved in deionised water to make 5 L of solution. The concentration of the copper sulphate solution is $x \times 10^{-3} mol L^{-1} $. The value of x is _ _ _ _ . (Nearest integer)
[Atomic masses – Cu:63.54 u, S:32 u, O: 16 u, H: 1 u]
Solution
$Molarity = \frac {n}{V} = \frac {w}{M_0 L} $
$\therefore Molarity = \frac {80}{249.54 \times 5 } \approx 64 \times 10^{-3} mol L^{-1} $
$\therefore x = 64 $
