Neco Model Questions Vol1 2025 Chemistry Question 43
Practice objective / multiple choice question 43 from the 2025 Neco Model Questions Vol1 Chemistry examination.
A buffer solution is to be prepared by mixing benzoic acid (C₆H₅COOH, \(K_a = 6.3 \times 10^{-5}\)) and its sodium salt sodium benzoate (C₆H₅COONa) so that the total concentration of acid plus conjugate base is 0.500 mol L\(^{-1}\) and the pH is 4.00. Calculate the masses of benzoic acid and sodium benzoate required to prepare 250.0 mL of this buffer.
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This is Neco Model Questions Vol1 2025 Chemistry Question 43. It is one of the objective questions from the 2025 Neco Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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