Igcse Model Questions Vol1 2018 Chemistry Question 17
Practice objective / multiple choice question 17 from the 2018 Igcse Model Questions Vol1 Chemistry examination.
A buffer solution is prepared by dissolving 0.200 mol of acetic acid \(\mathrm{CH_3COOH}\) and 0.150 mol of sodium acetate \(\mathrm{CH_3COONa}\) in enough water to make 1.00 L of solution. The acid dissociation constant of acetic acid is \(K_a = 1.8 \times 10^{-5}\). (a) Calculate the initial pH of the buffer. (b) How many millilitres of 0.100 M HCl must be added to the buffer to lower its pH to exactly 4.00? Assume the volume change on addition is negligible.
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About This Question
This is Igcse Model Questions Vol1 2018 Chemistry Question 17. It is one of the objective questions from the 2018 Igcse Model Questions Vol1 Chemistry examination.
Difficulty level: Medium .
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