Question

8.0575 x 10^-2 kg of Glauber's salt is dissolved in water to obtain 1 dm³ of a solution of density 1077.2 kg m^-3 Calculate the molarity, molality and mole-fraction of Na₂SO₄ in the solution.

Answer 1

In 1 dm³ solution, weight of Glauber's salt (Na₂SO₄.10H₂O) = 8.0575 x 10^-2 kg

322.3 g of Na₂SO₄.10H₂O contain 142 g of Na₂SO₄ 8.0575 x 10^-2g of Na₂SO₄. 10H₂O contain