[mahrap]

Why does the pH rise very fast at the very beginning of a weak acid with strong base titration and then goes into the buffer zone? In a strong acid and strong base titration there is no abrupt jump in the pH in the beginning; the pH rises slowly and steadyli until it gets close to the equivalence point and then the pH starts rising very fast and this is understandable because at this point there are less and less H_3_O^+^ ions in the solution because the OH^-^ ions have reacted with the majority of them. But why is there a large change in pH at the very beginning of a weak base and acid titration? thank you for all your help

[Borek]

I am not sure it is possible to give a simple answer to "why". If you calculate it - it behaves this way. If you measure it - it behaves this way. This is just a characteristic of the system.