NAOH + CH;CH2COOHCH3CH;COONA + H2O A buffer solution is formed when sodium hydroxide is added to an excess of aqueous propanoic acid.

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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(b) Sodium hydroxide reacts with propanoic acid in the following equation:
NaOH + CH3CH,COOHCH3CH2COONA + HLO
A buffer solution is formed when sodium hydroxide is added to an excess of aqueous
propanoic acid.
(i) Calculate the number of moles of propanoic acid in 50.0 cm of 0.125 mol dm
aqueous propanoic acid.
(ii)
Use your answers to part (b)(i) to calculate the number of moles of propanoic
acid in the buffer solution when 2.00 cm' of 0.500 mol dm aqueous sodium
-3
hydroxide are added to
50.0 cm' of 0.125 mol dm
aqueous
propanoic acid.
) Hence calculate the pH of this buffer solution at 298.15 K.
Transcribed Image Text:(b) Sodium hydroxide reacts with propanoic acid in the following equation: NaOH + CH3CH,COOHCH3CH2COONA + HLO A buffer solution is formed when sodium hydroxide is added to an excess of aqueous propanoic acid. (i) Calculate the number of moles of propanoic acid in 50.0 cm of 0.125 mol dm aqueous propanoic acid. (ii) Use your answers to part (b)(i) to calculate the number of moles of propanoic acid in the buffer solution when 2.00 cm' of 0.500 mol dm aqueous sodium -3 hydroxide are added to 50.0 cm' of 0.125 mol dm aqueous propanoic acid. ) Hence calculate the pH of this buffer solution at 298.15 K.
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