A buffer solution is prepared by dissolving 0.250\,mol of acetic acid (CH_{3}COOH, Ka = 1.8 imes10^{-5}) and 0.150\,mol of sodium acetate (CH_{3}COONa) in 1.00\,L of water. (a) Determine the initial pH of the solution. (b) After adding 0.020\,mol of HCl, what is the new pH?

Question

A buffer solution is prepared by dissolving 0.250\,mol of acetic acid (CH_{3}COOH, Ka = 1.8	imes10^{-5}) and 0.150\,mol of sodium acetate (CH_{3}COONa) in 1.00\,L of water. (a) Determine the initial pH of the solution. (b) After adding 0.020\,mol of HCl, what is the new pH?

Accepted Answer

Initial pH = 4.52; pH after HCl addition = 4.43

Neco Model Questions Vol1 2017 Chemistry Question 7

A buffer solution is prepared by dissolving 0.250\,mol of acetic acid (CH_{3}COOH, Ka = 1.8\times10^{-5}) and 0.150\,mol of sodium acetate (CH_{3}COONa) in 1.00\,L of water. (a) Determine the initial pH of the solution. (b) After adding 0.020\,mol of HCl, what is the new pH?

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