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  4. Strong base ( NaOH ) is being titrated with strong acid (HCl), variation of pH with volume of acid added is shown by

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Q. Strong base $( NaOH )$ is being titrated with strong acid $(HCl)$, variation of $pH$ with volume of acid added is shown by

Equilibrium

Solution:

$NaOH$ (a strong base) has $pH >7$

As, $HCl$ is added, $NaOH$ is neutralised.

$NaOH + HCl \rightleftharpoons NaCl + H _{2} O$

Thus, basic solution $( pH >7)$ changes to neutral $( pH =7)$ and then to acidic solution $( pH <7)$ when excess of $HCl$ is added.