Explain the equivalence point occurred at ml

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Question- A 0.552-g sample of ascorbic acid (vitamin C) was dissolved in water to a total volume of 20.0 mLand titrated with 0.1103 MKOH, and the equivalence point occurred at 28.42 mL. The pH of the solution at 10.0 mL of added base was 3.72.

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