Consider the titration of 100.0 mL of the weak diprotic acid H 2 A (0.10 M)with 0.20 M NaOH.What are the major species at each of the following points in the titration? (Water is always assumed to be a major species. )
-After 25.0 mL of 0.20 M NaOH is added

Question

Quizplus · Accepted Answer

At the beginning of the titration, the weak diprotic acid H₂A is the major species in solution. As NaOH is added, it reacts with the acid to form its conjugate base and water. After 25.0 mL of 0.20 M NaOH is added, half of the total volume has been titrated (50.0 mL), which corresponds to the equivalence point for the first proton transfer reaction. At this point, half of the acid has been neutralized and converted to its conjugate base (HA^-), while the other half remains as the weak acid (H₂A). Therefore, the major species in solution are H₂A (weak acid) and its conjugate base HA^-.

Consider the Titration of 100