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Titration curves. Weak acid and strong base!

Titration curves. Weak acid and strong base!

Fatima SJ

So the question in the paper is:On the axes below, sketch the titration curve for this reaction when 30 cm3of the sodium hydroxide is added to 25.0 cm3 of the vinegar solution.
In the mark scheme the vertical section was drawn at 12.5cm3. Why? Shouldnt it be at 25? because there's an excess of the base? Usually the vertical section is drawn at the least quantity of volume. Help me on this one pls

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