A student titrates 25.0 mL of 0.200 M acetic acid, CH₃COOH ( )
CHEMISTRY · Multi-part · A Level · Chemistry · Acids and bases · Acids and bases
Problem
A student titrates 25.0 mL of 0.200 M acetic acid, CH₃COOH (Ka=1.8×10−5), with 0.100 M NaOH until the equivalence point is reached.
(a) Calculate the volume (in mL) of NaOH required to reach the equivalence point.
(b) Determine the molar concentration of acetate ions, CH₃COO⁻, present in the reaction vessel at the equivalence point.
(c) Compute the pH of the solution at the equivalence point. Show all work and report the final answer to two decimal places.
(d) Phenolphthalein changes color in the pH range 8.3 – 10.0. State whether this indicator is appropriate for detecting the endpoint of this titration and support your answer with quantitative evidence.