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JEE Main Chemistry question

ChemistryEquilibriumJEE Main

A weak acid HA after treatment with 12 mL of 0.1 M strong base BOH has a pH of 5. At the end point, the volume of same base required is 26.6 mL. Ka of acid is:

Answer: (B)

Solution

Total acid∝26.6×0.1=2.66 mmol. After 12 mL base (1.2 mmol): salt=1.2,

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Question ID VK-136525