Difference Between Endpoint and Equivalence Point


Titration is a technique used in analytical chemistry to determine concentration of unknown solutions by using solutions of known concentration. Solution of known concentration is known as titrant while solution of unknown concentration is known as analyte in titration technique.


As we all know, the number of diabetes patients is increasing day by day worldwide. Do you know the drugs used for treatment of diabetes contain metals in a specific amount? The metal content in a drug can be determined by titration techniques (complexometric titrations). It is a very useful, simple and low-cost technique for various medicinal applications in the pharmaceutical field. So, you should have a good understanding of titration technique. 


To understand the titration technique, you need to have a clear understanding of the terms related to it such as pipette, burette, titrant, analyte end point and equivalence point etc. Generally, students get confused between endpoint and equivalence point so in this article we will discuss these two terms clearly and comparatively in detail. 


End point and equivalence point are closely related and confusable. Both the points show very important stages of titration during performing the titration experiment. Still both points are different and show two different stages of titration. 


What is Endpoint?

Endpoint in titration refers to the point at where the indicator changes color in the colorimetric titration. For example, in complexometric titration, if Eriochrome Black T is used as an indicator then at the end point color changes from wine red to blue. 


What is Equivalence Point? 

Equivalence point is also known as a stoichiometric point in titration. During titration the point at which the added titrant is chemically equivalent to the analyte in the sample is called equivalence point. 


Difference between Equivalence point and Endpoint

Equivalence point 

Endpoint 

The point in the titration process where the chemical reaction in the titration mixture ends is called equivalence point.

The point in the titration process which is indicated by color change of the indicator is called endpoint. 

It is the point where the analyte has completely reacted with the titrant. 

It doesn’t always give the point where the analyte has completely reacted with the titrant. 

It is not always indicated by color change of the reaction mixture. 

It is always indicated by the color change of the reaction mixture. 

It gives the point where reaction ends. 

It doesn’t always give the point where reaction ends. 

It comes either almost with endpoint or before the endpoint.

It comes either almost with the equivalence point or after the equivalence point.

Weak acids can show multiple equivalence points during titration. 

Weak acids can show only one endpoint during titration. 


This was the difference between end point and equivalence point, if you are confused in other confusable terms used in chemistry such as isotropic and anisotropic, orbit and orbital, petrol and diesel, sigma and pi bonds, thermoplastic and thermosetting plastics etc. then register yourself on Vedantu or download Vedantu learning app for class 6-10, IITJEE and NEET. You can get many more such articles, detailed study material and NCERT Solutions of all subjects on Vedantu.