Question

Concentrated aqueous sulphuric acid is 98% H₂SO₄ by mass and has a density of 1.80 g mL^-1. Volume of acid required to make one litre of 0.1 M H₂SO₄ solution

• A. 16.65 mL
• B. 22.20 mL
• C. 5.55 mL
• D. 11.10 mL

Answer 1

Answer: (C)

$\text{M}=\frac{w/w\%\times d\times 10}{\text{mol}\text{.}\text{weight}}$

$=\frac{98\times 1.8\times 10}{98}$

$\therefore \text{M}=18\text{M}$

$\text{Now},{\text{M}}_{\text{1}}{\text{V}}_{\text{1}}{\text{=M}}_{\text{2}}{\text{V}}_{\text{2}}$

$\Rightarrow 18\times {\text{V}}_{\text{1}}=0.1\times 1000$

$\Rightarrow {\text{V}}_1=\frac{100}{18}$

$=5.55\text{mL}$