Answer to Question #120357 in Inorganic Chemistry for Jamie Koonoolal

Question

In an experiment, 13.88 g of potassium propionate, C2H5CO2K, were weighed in a beaker and
dissolved in a small amount of distilled water. The mixture is transferred to a 100 mL volumetric
flask, made up to the mark and shaken well. 50.0 mL of this standard solution is mixed with 50.0
mL of a standard solution of propionic acid, C2H5CO2H in order to prepare a buffer solution of
pH 5.66. The molar mass of potassium propionate is 112 g mol-1
and the pKa of propionic acid is
4.87.
(i) What is the concentration of the propionic acid used to make the buffer? (4 marks)

5.0 mL of 5.0 M nitric acid were added to 100.0 mL of the buffer.
(ii) Give a chemical equation to show the effect of nitric acid on the buffer. (2 marks)
(iii) Calculate the new concentration of the propionic acid in the mixture. (

Answer 1

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