Question

$100ml$ of $0.1M{H}_{2}S{O}_4$ and $100ml$ of 0.1M KOH are mixed together and diluted to exactly two litres. Normality of unreacted acid in the mixture is:

• A. $2\times {10}^{-3}N$
• B. $5\times {10}^{-3}N$
• C. $5\times {10}^{-2}N$
• D. $2\times {10}^{-2}N$

Answer 1

The correct option is C $5\times {10}^{-2}N$

moles of unreacted acid $=0.1\times 0.1\times 2-0.1\times 0.1=0.005$

equivalents of unreacted acid $=0.005\times 2=0.01$

Normality $=\frac{0.01}{0.2}=5\times {10}^{-2}$ N