When 250 cm3 of a saturated solution of CuSO4 at 30°C was evaporated to dryness, 5.0 g of the salt was obtained.. What is the solubility of the salt at 30°C? [CuSO4 = 160]

When 250 cm3 of a saturated solution of CuSO4 at 30°C was evaporated to dryness, 5.0 g of the salt was obtained..
What is the solubility of the salt at 30°C? [CuSO4 = 160]
A. 0.031
B. 0.125
C. 0.640
D. 1.560

Correct Option: Answer is B
solubility of salt = number of moles of salt / volume of solution
number of moles of salt = mass of salt / molar mass of solution = 5/160 = 0.03125 mol
volume of solution = 250cm3 = 0.25 dm3
solubility of salt = 0.03125/0.25
= 0.125 mol dm-3

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