Question

The volume of water to be added to $100c{m}^3$ of a $0.5$ N $H_{2}S{O}_4$ to get a decinormal solution is:

• A. $200c{m}^3$
• B. $300c{m}^3$
• C. $400c{m}^3$
• D. $500c{m}^3$

Answer 1

The correct option is C $400c{m}^3$

As per the concept of dilution,
$N_1{V}_1=N_2{V}_2$
Decinormal means that the normality $=0.1N$
$(0.5\times 100)=(0.1\times V_2)$
$V_2=500c{m}^3$
So, the volume of water added should be $(500-100)c{m}^3=400c{m}^3$