Final answer:
Titration cannot be used to distinguish between a strong and a weak acid because the shape of the titration curve for a weak acid or a weak base depends heavily on their identities and the values of their acid dissociation constants (Ka) or base dissociation constants (Kw).
Step-by-step explanation:
The shape of the titration curve involving a strong acid and a strong base depends only on their concentrations, not their identities. However, titration cannot be used to distinguish between a strong and a weak acid because the shape of the titration curve for a weak acid or weak base depends heavily on their identities and the values of their acid dissociation constants (Ka) or base dissociation constants (Kw). The pH changes more gradually around the equivalence point in the titration of a weak acid or a weak base.