JEE Main 2024 Chemistry question
The pH of an aqueous solution containing 1 M benzoic acid = 4.20) and 1 M sodium benzoate is 4.5. The volume of benzoic acid solution in 300 mL of this buffer solution is mL. (given : log2 = 0.3)
Answer: 100
Solution
pH = + log[(300 − V)/V]: 4.5 = 4.2 + log[(300 − V)/V], so (300 − V)/V = = 2, giving V = 100 mL.