Question

If 40 grams of saturated solution of common salt at 40oC is cooled to 15oC. How many grams of salt will be precipitated if the solubility of salt at 40oC is 29 and at 15o C is 23?

Answer 1

weight of salt = 90 gram,

solubility = 50

sing formula

solubility of solute =

weightofsolventinsaturatedsolution

weightofsoluteinsaturatedsolution

×100

or 50=

weightofsolventinsaturatedsolutio

90gm

×100

so weight of solvent in saturated solution =

50

90gm

×100=180gm

Hence 180 gm of water is required to prepare a saturated solution.