Goal #6: Volume of HCi at equvalence point Ale 50 CI at equivalence pointu5O Sho

Question

Goal #6: Volume of HCi at equvalence point Ale 50 CI at equivalence pointu5O Show the calculations that are used to experimentally determine from the titration data the acetate concentration of the buffer: How does the experimentally determined acetate concentration compare to the assigned concentration? S.ao Volume of NaOH at equivalence pointa Show the calculations that are used to determine the acetic acid concentration of the buffer from the titration data: How does the experimentally determined acetic acid concentration compare to the assigned concentration? 20

Explanation / Answer

(i) The volume of HCl at equivalence point = 26.5 mL

The no. of mmol of HCl = 26.5 mL * 0.135 mmol/mL = 3.5775 mmol

At the equivalence point, the no. of mmol of acetate = 3.5775 mmol

Hence, equal mmol of both HCl and CH3COONa reacts to form the same mmol of CH3COOH.

Therefore, the concentration of acetate in the buffer = 0 M

(ii) The volume of NaOH at equivalence point = 25.2 mL

The no. of mmol of NaOH = 25.2 mL * 0.125 mmol/mL = 3.15 mmol

At the equivalence point, the no. of mmol of acetic acid = 3.15 mmol

Hence, equal mmol of both NaOH and CH3COOH reacts to form the same mmol of CH3COONa.

Therefore, the concentration of acetic acid in the buffer = 0 M

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