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Question Q164) Concentrated aqueous sulphuric acid is 98% H2SO4 by mass and has a density of 1.80 gmL–1. Volume of acid required to make one litre of 0.2 M H2SO4 solution is



SOLUTION

To make 0.1 M of H2SO4
Molecular weight of H2SO4 is 98 g
∴ 19.6 g of sulphuric acid require to make 1L of 0.2M solution
As purity is 98% thus acid required will be =20 g
Now density is 1.8gmL-1 therefore weight of 1000mL acid = 1800 g
∴ 20g = 11.11 mL
Alternate method you can use formula for M if density and %w/w given
M=(%w/w × density ×10)/(molecular mass)
Then use M1V1 = M2V2
Answer (d)