Question

Normality of the mixture of $100$ mL $1NHCl$ and $50$ mL $1NNaOH$ is ______ ${10}^{-3}N$.

Answer 1

Here, HCl is used in excess.
Hence, the mixture is acidic.
The normality of the mixture $=\frac{V_a{N}_a-V_b{N}_b}{V_a+V_b}=\frac{100\times 1-50\times 1}{100+50}=0.333N=333\times {10}^{-3}N$