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  4. A weak monobasic acid is half neutralized by a strong base. If the pH of the solution is 5.4 its pKa is

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Q. A weak monobasic acid is half neutralized by a strong base. If the pH of the solution is 5.4 its $pK_a$ is

Equilibrium

Solution:

At the half neutralisation point
$pH=pK_{a}=5.4$