Answer
The best representation is in the drawing number $(iv)$;
Work Step by Step
- Polyprotics acids have more than one equivalence point, therefore, the best representation is in the drawing number $(iv)$.
- Example: $H_2SO_4$
The drawing has an equivalence point for when all the $H_2SO_4$ was consumed to produce $HS{O_4}^-$, and another one for when all the $HS{O_4}^-$ was consumed to produce $S{O_4}^{2-}$.
