Question

Calculate the mass of sodium sulphate required to prepare it's 20percent solution in 100gram of water.

Answer 1

Mass percent = Mass of solute / Mass of solution × 100

%(m/m) = [m / (m + M)] × 100

20 = [m / (m + 100)] × 100

0.2 = m / (m + 100)

0.2m + 20 = m

0.8m = 20

m = 25 grams

Mass of sodium sulphate = 25 grams

Answer 2

Answer:

Given that the mass percent of sodium sulphate solution is 20%. Let the mass of sodium sulphate which is required to prepare this solution be x grams. Given that the mass of water is 100 g. Thus, 25g of sodium sulphate is required.

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