of a solution of potassium hydroxide is transferred to an empty volumetric flask. This flask is made up to the mark with distilled water and then shaken well. What is the concentration of the potassium hydroxide in the second flask?

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2 Jun 2021

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burgundyeel226

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? 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. (iii) Calculate the new concentration of the propionic acid in the mixture.