Four 0.50 L acetate buffer solutions are prepared

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

Problem

Four 0.50 L acetate buffer solutions are prepared, each having a combined buffer component concentration of 1.0 M. After 0.020 mol of solid NaOH is dissolved in each beaker, which buffer will experience the smallest change in pH? (a) [CH3COOH]=0.75 M;  [CH3COO−]=0.25 M[CH_{3}COOH] = 0.75\,\text{M};\; [CH_{3}COO^{-}] = 0.25\,\text{M} (b) [CH3COOH]=0.60 M;  [CH3COO−]=0.40 M[CH_{3}COOH] = 0.60\,\text{M};\; [CH_{3}COO^{-}] = 0.40\,\text{M} (c) [CH3COOH]=0.50 M;  [CH3COO−]=0.50 M[CH_{3}COOH] = 0.50\,\text{M};\; [CH_{3}COO^{-}] = 0.50\,\text{M} (d) [CH3COOH]=0.10 M;  [CH3COO−]=0.90 M[CH_{3}COOH] = 0.10\,\text{M};\; [CH_{3}COO^{-}] = 0.90\,\text{M}

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