How many mL of a 0.149 M aqueous solution of sodium sulfate, Na2SO4, must be taken to obtain 5.14 grams of the salt?

Question

How many mL of a 0.149 M aqueous solution of sodium sulfate, Na₂SO₄, must be taken to obtain 5.14 grams of the salt?

Answer 1

0.149 M Na₂SO₄ = 0.149 mols Na₂SO₄ / liter

molar mass Na₂SO₄ = 142 g / mol

Using dimensional analysis, we can solve as follows:

5.14 g Na₂SO₄ x 1 mol / 142 g x 1 L / 0.149 mols = 0.243 L Na₂SO₄ x 1000 mls / L = 243 mls Na₂SO₄