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)

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

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

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

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

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

$\Rightarrow \, \text{V}_{1}=\frac{100}{18}$

$=5.55 \, \text{mL}$