Gce Model Questions Vol1 2021 Chemistry Question 3
Practice objective / multiple choice question 3 from the 2021 Gce Model Questions Vol1 Chemistry examination.
A buffer solution is prepared by dissolving \(0.20\ \text{mol}\) of acetic acid (\(\mathrm{CH_3COOH}\)) and \(0.15\ \text{mol}\) of sodium acetate (\(\mathrm{CH_3COONa}\)) in \(1.0\ \text{L}\) of water. The acid dissociation constant is \(K_a = 1.8\times10^{-5}\). (a) Calculate the initial pH of the buffer. (b) How many moles of \(0.10\ \text{M}\) HCl must be added to lower the pH to 4.50? (c) After the addition, what is the new ratio \([\mathrm{A^-}]/[\mathrm{HA}]\) in the solution?
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This is Gce Model Questions Vol1 2021 Chemistry Question 3. It is one of the objective questions from the 2021 Gce Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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