A buffer solution is prepared by dissolving 0.20 mol of acetic acid (CH_{3}COOH, K_{a}=1.8 imes10^{-5}) and 0.30 mol of sodium acetate (CH_{3}COONa) in enough water to make 1.00 L of solution. (a) Calculate the initial pH of the buffer. (b) After adding 0.05 mol of HCl to the solution, what is the new pH? Give answers to two decimal places.

Question

A buffer solution is prepared by dissolving 0.20 mol of acetic acid (CH_{3}COOH, K_{a}=1.8	imes10^{-5}) and 0.30 mol of sodium acetate (CH_{3}COONa) in enough water to make 1.00 L of solution. (a) Calculate the initial pH of the buffer. (b) After adding 0.05 mol of HCl to the solution, what is the new pH? Give answers to two decimal places.

Accepted Answer

Initial pH = 4.92; after addition pH = 4.74

Neco Model Questions Vol1 2018 Chemistry Question 33

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