which acid base pair has the highest pH at the equivalence point
ch3cooh and NaOH
Ch3COOH and NH3
HCl and NaOH
HCl and NH3
for the second one, ammonium acetate, its the salt of a weak acid and weak base so when added to water you could imagine getting a weak acid, weak base, so pH of salt will be close to neutral.
same for third example, salt would be NaCl, the salt of a strong base and a strong acid so pH of salt is close to neutral.
and the last one, salt would be ammonium chloride, the salt of a strong acid and a weak base, so salt is acidic