Final answer:
The pH of the solution can be calculated using the ICE approach, and the resulting pH is acidic.
Step-by-step explanation:
(a) The initial pH is computed for the acetic acid solution in the usual ICE approach:
[H₂O+1²
Ka =
[H3O+][CH3 CO₂] [CH3COH]
[CH,CO2H]o
[H3O+] = Ka × [CH3CO₂H] = √1.8 × 10^-5 × 0.100 = 1.3 × 10^-3
pH = -log(1.3 × 10^-³) = 2.87
(b) The acid and titrant are both monoprotic and the sample and titrant solutions are equally concentrated; thus, this volume of titrant represents the equivalence point. Unlike the strong-acid example above, however, the reaction mixture in this case contains a weak conjugate base (acetate ion). The solution pH is computed considering the base ionization of acetate, which is present at a concentration of