Three lactic acid buffer solutions

CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases

Problem

Three lactic acid buffer solutions, each 1.0 L1.0\,\text{L} and at the same temperature, have the compositions shown. Buffer I: [HA]=0.30 M,  [A−]=0.10 M[\text{HA}]=0.30\,\text{M},\;[\text{A}^-]=0.10\,\text{M} Buffer II: [HA]=0.20 M,  [A−]=0.20 M[\text{HA}]=0.20\,\text{M},\;[\text{A}^-]=0.20\,\text{M} Buffer III: [HA]=0.10 M,  [A−]=0.30 M[\text{HA}]=0.10\,\text{M},\;[\text{A}^-]=0.30\,\text{M} When equal amounts of (a) strong acid and (b) strong base are separately added to each buffer, which of the following rankings is correct? (a) (a) I > II > III (b) III > II > I (b) (a) II > I > III (b) II > III > I (c) (a) III > II > I (b) I > II > III (d) (a) III > II > I (b) III > II > I

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