Question

When 100g of a saturated solution is evaporated at ${50}^{\circ }C$, 50g of solid is left over. Find the solubility of the substance at ${50}^{\circ }C$

Answer 1

Solid left over on evaporation is 50 g Solubility (S)
$=\left(W\right(solute\left)/Wsolvent\right)\times 100$ ............ (1)
Amount of solute $=$ 50 g ................ (2)
$W_{solution}=W_{solute}+W_{solvent}$
$\Rightarrow 100=50+W_{solvent}$
$W_{solvent}=50g$ ............ (3)
Substituting (2) and (3) in (1), we get Solubility (S) $=\left(50/50\right)\times =100$