Question

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36. A student was carrying out a titration experiment. He wrote in his copybook that the equivalence point and the end point are different. Do you agree or disagree with this student? Justify your answer.

Answer 1

Yes Agree. Equivalence point and end point can be different.

1) Endpoint is the stage in titration that is indicated by a color change as a sign that titration is complete and the equivalence point has been achieved. Equivalence point, on the other hand, is the stage just before the endpoint that signals the stoichiometric point with equal number of moles between the analyte and the titrant in line with the chemical equation. To reach the equivalence point, the titrant must be poured accurately and precisely drop by drop using the burette.

2) Equivalence point occurs when the number of moles of the titrant, the standard solution, is equal to the number of moles of the analyte, the solution with unknown concentration. Endpoint occurs when the color change.

3) Equivalence point means that the titrant has reacted fully with the analyte whereas the endpoint signals the completion of titration. Endpoint and equivalence can occur at the same time if the pH of the titrant corresponds to the pH at equivalence point.