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JEE Main Chemistry question

ChemistryEquilibriumJEE Main

20 mL of a weak monobasic acid requires 20 mL of 0.2 M NaOH for complete titration. Upon addition of 10 mL of this basic solution to 25 mL of the above acid, the pH is 5.82. What is the value of of this weak acid?

Answer: 6

Solution

Moles for complete titration of 20 mL acid mol = moles acid in 20 mL, so acid conc. M. 10 mL of 0.2 M ( mol) added to 25 mL of 0.2 M

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Question ID VK-136619