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Q-1. $\mathrm{NaNO}_{2}$ is a basic salt (weak conjugate base of $\mathrm{HNO}_{2}$ ) and $\mathrm{OH}$ - is formed by hydrolysis of nitrite ions. Thus, $60 \mathrm{~mL}$ of $0.02 \mathrm{M} \mathrm{NaNO}_{2}$ is titrated with $0.04 \mathrm{M} \mathrm{HCl}$. Calculate $\mathrm{pHs}$ in the addition of a) $0 \mathrm{~mL}$, b) $2 / 3$ times of equivalent point volume $(2 / 3 \mathrm{Ve})$ and equivalent point volume (Ve) of $\mathrm{HCl}$. $\mathrm{Ka}$ is $5.0 \times 10^{-4}$ for $\mathrm{HNO}_{2}$. (20 $\left.\mathrm{P}\right)$. Please use titration reaction of $\mathrm{NaNO}_{2}+\mathrm{HCl} \rightarrow \mathrm{NaCl}+\mathrm{HNO}_{2}$

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