Question

A china dish weigh 28g when empty. When a saturated solution of sodium nitrate is poured in it at 20° The weight of the dish is 75g . When the solution is evaporated to dryness the china dish along with the crystals weight 50g. Find the solublitity of sodium nitrate at 20°C​

Answer 1

Answer:

Correct option is

C

39.5

A china dish weighs 25 g when empty. When a saturated solution of potassium chloride is poured into it at 40

o

C, the weight of the dish is 63 g.

Hence, the weight of KCl solution is 63−25=38 g.

When the solution is totally evaporated, the chine dish along with the crystals weighs 40 g.

The weight of solid KCl is 40−25=15 g.

The solubility of potassium chloride at 40

o

C=

38

15

×100=39.5 g KCl / 100 g