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JEE Advanced2020ChemistryIonic EquilibriumActual

A solution of 0 . 1 M weak base ( B ) is titrated with 0 . 1 M of a strong acid ( HA ) . The variation of pH of the solution with the volume of HA added is shown in the figure below. What is the pK b of the base? The neutralization reaction is given by B + HA → BH + + A - .

Correct answer

3

Step-by-step solution

At 3   ml   pH of solution is 11 . B + HA → BH + + A − at 3 best buffer action is shown So, P OH = P K b = 3 (As basic buffer is formed) So, P K b = 3

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