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  4. During titration of acetic acid with aq. NaOH solution, the neutralisation graph has a vertical line. This line indicates

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Q. During titration of acetic acid with aq. $NaOH$ solution, the neutralisation graph has a vertical line. This line indicatesChemistry Question Image

AIIMSAIIMS 2007Equilibrium

Solution:

In any type of acid base titration, there is a sudden change in the pH value at the end point. During the titration of a weak acid with a strong base, beyond the equivalent point, the solution will contain the salt and excess of free base.
$CH_3COOH + NaOH \rightarrow \underset{\text{Sodium acetate}}{CH_3COONa}+H_2O$
Due to the presence of free base, solution becomes alkaline in nature.