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How do the equivalence point and the end point of a titration differ?
AThe equivalence point is measured, the end point is calculated
BThe equivalence point is where the dye is added to the flask
CThe equivalence point is always reached after the end point
DThe equivalence point is exact reaction, the end point is observed
Answer & Solution
Correct answer: D. The equivalence point is exact reaction, the end point is observed
1. The equivalence point is the titrant volume that reacts exactly with all the analyte.
2. It is fixed by the stoichiometry of the titration reaction.
3. The end point is the titrant volume actually recorded when the observed change appears.
4. That change may be a colour change from an indicator or a measured solution property.
5. A well designed method keeps the gap between the two negligible.
6. So the equivalence point is the ideal target and the end point is what the analyst reads.
7. Calling the equivalence point the measured value reverses the two definitions.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 4 "Stoichiometry of Chemical Reactions", section 4.5 Quantitative Chemical Analysis_
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