The following four aqueous mixtures are proposed as buffers to maintain a solution…
CHEMISTRY · Multi-part · A Level · Chemistry · Acids and bases · Acids and bases
Problem
The following four aqueous mixtures are proposed as buffers to maintain a solution near pH 7.00 at 25 °C. All mixtures are 0.20 M in total conjugate-pair concentration.
(a) Calculate the initial pH of each mixture.
(b) Rank the mixtures in order of decreasing capacity to neutralize an added strong acid. Justify your ranking with appropriate chemical equations and numerical reasoning.
(c) Rank the mixtures in order of decreasing capacity to neutralize an added strong base. Justify your ranking with appropriate chemical equations and numerical reasoning.
(d) Identify which mixture best satisfies both requirements of having an initial pH close to 7.00 and a high capacity to neutralize both added acid and added base. Support your choice with evidence from your earlier work.