Question

It is required to prepare 6 l of 3 n h2so4 solution how many ml of 60% acid

Answer 1

With acids normality refers to the concentration of H+ (or H3O+). For example, 1 M solution of HCl is also 1 N since 1 mole of HCl contains 1 mole of H+. For a diprotic acid like H2SO4, a 1 M solution of H2SO4 is 2 N since 1 mole of H2SO4 contains 2 moles of H+. To make a 3 N H2SO4 solution one would make a 1.5 M H2SO4 solution.

To actually prepare 1 liter of a 1.5 M H2SO4 solution one needs to know the concentration of the stock H2SO4. Concentrated H2SO4 from Sigma-Aldrich is 17.8–18.4 M (calculated from the density at 25 C (1.84 g/ml), molecular weight (98 g/mol), percent H2SO4 (95–98)). One would add 81.5–84.1 ml to a final volume of 1 Liter for a ~3 N H2SO4 solution.