what are the four strong weak acid base combinations of the titration process? For each combination, determine the expected pH at the equivalence point and determine the appropriate pH indicator

Answer 1

Strong acid = HCl

Weak base = NH₃

NH₃(aq) + HCl(aq) ==> NH₄Cl(aq)

NH₃(aq) + H⁺(aq) ==> NH₄⁺(aq) (eliminating Cl^- as the spectator)

Since this is a weak base and a strong acid, the pH at equivalence will be <7. To find the actual pH, you need to know the pKa NH₄⁺ and concentrations.

An indicator that changes pH in the acidic range would be appropriate. A possible choice would be methyl red.

You can do others. Are you asking for strong acid/weak base, strong base/weak acid, or only strong acid/weak base. The question isn't really clear.