How Is the Volume of Ethanoic Acid Determined from the Titration Graph?

[youmei0426]

Homework Statement

the question asks for the concentration of ethanoic acid, therefore I need to find out the volume of ethanoic acid used during the titrations. I thought it would be 30mL because that's when the temperature reaches maximum. But the answer says that the volume should be in the range of 25.5-26.5, and I don't know how it is read from the curve. Thanks in advance!

Homework Equations

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The Attempt at a Solution

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[mfb]

The point at 25 is very close to the maximum already. The variations afterwards are probably just fluctuations or the mixture slowly returning to room temperature. You can draw two straight lines in the plot and see where they meet.