Question

Concentrated sulphuric acid has density of 1.9 g/mL and $99\%$ $H_{2}S{O}_4$ by mass. Calculate the molarity of the acid.

• A. 18.19 M
• B. 24.19 M
• C. 19.19 M
• D. 9.19 M

Answer 1

Answer: (C)

19.19 M

100g solution contains 99g $H_{2}S{O}_4$

Moles of $H_{2}S{O}_4$ =$\frac{99}{98}$, Volume of solution =$\frac{100}{1.9}$ mL

Therefore, Molarity =$\frac{99}{98}\times \frac{1.9}{100}\times 1000=$ 19.19 M

Hence, the correct option is $C$