Calculate how many grams of solution are needed to provide 2.50 grams of sulfuric acid.

Question

 A chemist needs 2.50 grams of sulfuric acid (H2SO4, MM = 98.08 g/mol) for a reaction, and she only has access to a 15.0% m/v H2SO4 solution (d = 1.84 g/mL). Calculate how many grams of solution are needed to provide 2.50 grams of sulfuric acid.

Answer 1

15% (m/v) H2SO4 means 15 g H2SO4 per 100 ml solution

2.50 g H2SO4 x 100 ml / 15 g H2SO4 = 16.67 mls of solution

16.67 mls x 1.84 g/ml = 30.7g of solution