What mistake did this student make? Is it possible to determine the identity of

Question

What mistake did this student make? Is it possible to determine the identity of the unknown from this graph (with the help of the pKa table)? The student forgot to acidify the solution before titration. No, you can no longer determine the identify of the unknown. The student forgot to acidify the solution before titration. Yes, you can still determine the identify of the unknown. The student forgot to acidify the solution before titration. No, you can no longer determine the identify of the unknown. The student forgot to add universal indicator. No, you can no longer determine the identify of the unknown. The student forgot to add universal indicator. Yes, you can still determine the identify of the unknown.

Explanation / Answer

Titration

During the titration, the student makes an error. It is still possible to determine the pKa of the acid from the graph which is pH at half-way to the equivalence point.

The student forgot to acidify the solution before titration. Yes, you can still determine the identity of the uknown.

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