Question

b) What weight of sodium nitrate will separate when
a saturated solution containing 50 gram of water
is cooled from 50°C to 30°C ? The solubility of
NaNO3 at 50°C and 30°C is 114 g and 86 g
respectively
Ans. 14 g
​

Answer 1

Answer:

The solubility of NaNO3 at 50oC is 114 g i.e. 114 grams of NaNO3 is needed to make a saturated solution of NaNO3 in 100 g of water at 50oC. Hence, to make a saturated solution in 50 grams of water, we will require half of 114 grams of NaNO3 i.e. = 114/2 = 57 grams of NaNO3. At 30c the 50g solution willl have 43g.

Hence when sol is cooled 57-43=14g is separated out