. A student performing this exercise to evaluate the buffering capacity of a 0.0

Question

. A student performing this exercise to evaluate the buffering capacity of a 0.020M acetic acid/0.020M sodium acetate buffer obtained the following data while titrating 50.0ml of the buffer with a 0.010M hydrochloric acid solution. Manually (using graph paper and pen, not a computer generated plot) prepare a buffer capacity profile by plotting the pH as a function of volume of added acid. Determine the buffer capacity based on volume of added acid and determine the moles of acid required to produce this change. Show your work below. Volume HCl added 0.00mL 1.02mL 1.98mL 3.06mL 4.02mL 5.03mL 5.98mL 7.01mL 8.06mL pH 4.76 4.67 4.58 4.49 4.39 4.28 4.16 4.01 3.81 3.48 8.98mL

Explanation / Answer

In the graph it is seen that significant change in pH (about 1 unit) from 4.76 to 3.76 is brought by 8 mL of HCl addition. Hence 8 mL is the buffer capacity.

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