Several acids are listed here with their respective equi- librium constants. hf(aq) + h2o(l) uv h3o+(aq) + f−(aq) ka = 7.2 × 10−4 hpo42−(aq) + h2o(l) uv h3o+(aq) + po43−(aq) ka = 3.6 × 10−13 ch3co2h(aq) + h2o(l) uv h3o+(aq) + ch3co2−(aq) ka = 1.8 × 10−5 (a) which is the strongest acid? which is the weakest acid? (b) what is the conjugate base of the acid hf? (c) which acid has the weakest conjugate base? (d) which acid has the strongest conjugate base?