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Standard XII

Chemistry

Buffer Solutions

The pKa of ...

Question

The $p K_{a}$ of a weak acid if titration progress is monitored as follows, is :

data insufficient

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8.15

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3.88

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4.28

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Solution

The correct option is C 3.88
In the horizontal part of the curve, the solution is acting as buffer. At the inflection point, $[s a l t] = [a c i d]$ . Hence, $p H = p K_{a} = 3.88$ .

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The pKa of a weak acid if titration progress is monitored as follows, is :

The correct option is C 3.88In the horizontal part of the curve, the solution is acting as buffer. At the inflection point, [salt]=[acid]. Hence, pH=pKa=3.88.

The $p K_{a}$ of a weak acid if titration progress is monitored as follows, is :

The correct option is C 3.88
In the horizontal part of the curve, the solution is acting as buffer. At the inflection point, $[s a l t] = [a c i d]$ . Hence, $p H = p K_{a} = 3.88$ .