A solution has `80% (w)/(w) NaOH` with density `2gL^(-1)` Find (a) Molarity (b) Molality of solution .

Explanation

Let `V_("lit")` be vol. of solution
Mass of solute `= (d xx V) xx ((%(w)/(w)))/(100) = 2 xx V xx (80)/(100) = 1.6 V`
(a) `M = (1.6V//40)/(V) = 0.04 M` (b) `m = (1.6V//40)/(2V - 1.6V) xx 1000 = 100 mol kg^(-1)`