Concentrated sulphuric acid has a density of 1.9 g/mL and is 99% H_2SO_4 by weight. Calculate the molarity of H_2SO_4 in this acid.

Concentrated sulphuric acid has a density of 1.9 g/mL and is 99% H_2SO

1.	Concentrated sulphuric acid has a density of 1.9 g/mL and is 99% H_2SO_4 by weight. Calculate the molarity of H_2SO_4 in this acid.
Answer» Solution :Suppose we have 1 litre (1000 mL) of the given acid. Mass of 1000 mL of this acid= DENSITY x Volume = `1.9 xx 1000 = 1900` g The given acid is 99% pure. `therefore`The mass of `H_2SO_4` present in 1900 g (1L) of the 99 sample = `99/100 xx 1900 = 1881 g` Moles of `H_(2)SO_(4)` present in 1 L `=1881/98 = 19.19` (`therefore` Molecular mass of `H_(2)SO_(4) = 98`) HENCE, the molarity of the given `H_2SO_4` sample is 19.19 M.