Question

The volume of water to be added to $100c{m}^3$ of 0.5 M $H_{2}S{O}_4$ to get decimolar concentration is :

• A. 500 ml
• B. 100 ml
• C. 400 ml
• D. 300 ml

Answer 1

Answer: (C)

400 ml

The volume of water to be added to $100c{m}^3$ of 0.5 M $H_{2}S{O}_4$ to get decimolar concentration is 400 ml.

100 cc of 0.5 M $H_{2}S{O}_4$ contains 0.05 moles of $H_{2}S{O}_4$.

Decimolar solution means $0.1M$.

Volume required for decimolar conectration $=\frac{0.05}{0.1}=0.5m^3=500ml$

Hence, the volume of water added$=500-100=400ml$

Hence, the correct option is C.