End point

Definition

The end point in a titration is the stage at which the reaction between the titrant and the analyte is complete, typically indicated by a color change or other observable signal. It is used to determine the exact amount of substance present in a sample.

5 Must Know Facts For Your Next Test

1. The end point should ideally coincide with the equivalence point, but small differences can occur.
2. Indicators are substances used to signal the end point through a visible change, such as a color shift.
3. Accurate identification of the end point is crucial for precise quantitative chemical analysis.
4. Different types of titrations (acid-base, redox, complexometric) may use different indicators to determine their respective end points.
5. The volume of titrant added at the end point allows for stoichiometric calculations to find the concentration of an unknown solution.

Review Questions

• What role does an indicator play in determining the end point of a titration?
• How does the end point differ from the equivalence point in a titration?
• Why is it important for the observed end point to be as close as possible to the theoretical equivalence point?

Related terms

Equivalence Point: The exact stage during a titration where chemically equivalent amounts of reactants have been mixed.

Titrant: A solution of known concentration that is added to another solution to determine its concentration during a titration.

Indicator: $A substance that changes color at (or near) the equivalence or end point of a chemical reaction.$