Endpoint And Equivalence Point
Titration measures the concentration of an unknown solution that reacts with a solution of known concentration. The process is often used to check the purity of synthesized chemical compounds such as pharmaceuticals. The ideal point for completion of titration is known as the equivalence point. The end point demonstrates the equivalence point, typically by some form of indicator. For example, with a color indicator, the solution changes color when the titration reaches the endpoint.
The completion of titration is the endpoint, detected by some type of physical change produced by the solution such as a color change. The endpoint typically comes straight after the equivalence point, which is when the moles of a standard solution (titrant) equal the moles of unknown concentration (analyte) I.e the ideal point for the completion of titration. In a perfect titration, the endpoint and equivalence are identical.
What You Need To Know About Endpoint
- Endpoint is the point in the titration where the indicator changes its color.
- Endpoint does not always give the point where the unknown analyte has completely reacted with the titrant.
- It doesn’t always give the point where reaction ends.
- Weak acids can show only one endpoint during titration.
- Endpoint comes either almost with the equivalence point or after the equivalence point.
- Endpoint is always indicated by the color change of the reaction mixture.
- Endpoint occurs when the color change.
What You Need To Know About Equivalence Point
- The equivalence point in a titration is the point at which the chemical reaction in the titration mixture ends.
- Equivalence point gives the point where the unknown analyte has completely reacted with the titrant.
- It gives the point where reaction ends.
- Weak acids can show multiple equivalence points during titration.
- Equivalence point comes either almost with endpoint or before the end point.
- Equivalence point is not always indicated by color change of the reaction mixture.
- 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.
Also Read: Difference Between Dynamic And Static Equilibrium
Difference Between Endpoint And Equivalence Point In Titration
| BASIS OF COMPARISON | ENDPOINT | EQUIVALENCE POINT |
| Description | Endpoint is the point in the titration where the indicator changes its color. | The equivalence point in a titration is the point at which the chemical reaction in the titration mixture ends. |
| Results | Endpoint does not always give the point where the unknown analyte has completely reacted with the titrant. | Equivalence point gives the point where the unknown analyte has completely reacted with the titrant. |
| Reaction | It doesn’t always give the point where reaction ends. | It gives the point where reaction ends. |
| Weak Acids | Weak acids can show only one endpoint during titration. | Weak acids can show multiple equivalence points during titration. |
| Occurrence | Endpoint comes either almost with the equivalence point or after the equivalence point. | Equivalence point comes either almost with endpoint or before the end point. |
| Color Change | Endpoint is always indicated by the color change of the reaction mixture. | Equivalence point is not always indicated by color change of the reaction mixture. |
| Occurrence | Endpoint occurs when the color change. | 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. |
Also Read: Difference Between Chemical And Physical Change