Question

On heating 25g of a saturated solution to dryness at 60 degree Celsius, 4g of anhydrous salt was recovered. Calculate its solubility in g/100g of solvent

Answer 1

$$m_{water} = 25g - 4g = 21g.$$

$$m_{water} : m_{salt}$$ $$21g : 4g$$ $$100g : Xg$$

$$X = {100*4 \over 21} = 19.05g$$

Answer: 19.05g