[engelbrekt]

In polyprotic acids, why is the last equivalence point the sharpest on a titration curve?















Let me see if I've understood this now.































Before the first equivalence point there are two acid equilibria and buffer equilibria neutralizing the added NaOH. The capacity to buffer and keep a stable pH diminishes as the acid is neutralized. At the second equivalence point there is no longer any acid to buffer and neutralize NaOH, so the pH shoots up rapidly.































Have I understood this correctly?