Question

Identify the equivalence point on the titration curve shown here.

A is the equivalence point

B is the equivalence paint

C is the equivalence point pH

D is the equivalence point

 

Define the end point of a titration.

It is the point at which the pH no longer changes.

It is when a change that indicates equivalence is observed in the analyte solution.

It is a synonym for equivalence point.

Answer 1

Concepts and reason

This is a problem based on titration curve showing a titration between an acid and a base so as to identify the equivalence point.

In a titration, the point where the amount of titrant added neutralizes the analyte solution completely is the equivalence point.

The point at which an indicator changes color is the end point. 

Fundamentals

Titration curve is a plot of the pH as a function of added titrant. At a certain point in a titration of a strong acid or base analyte against the titrant (base or acid), the number of moles of analyte becomes equal to the number of moles of the titrant. This point is called the equivalence point. At this point there is very large change in pH over a small range of the added titrate volume .

Equivalence point is where the titration curve exhibits an inflection point.

From the figure, the points A, B and D are not the equivalence points.

From the figure, C is the steepest point and hence it is the equivalence point.

End point is not defined as the point at which pH no longer changes or a synonym for equivalence point.

The correct definition for end point is that end point is the change that indicates equivalence is observed in the analyte solution.

Ans:

The equivalence point in the given curve is C.

It is when a change that indicates equivalence is observed in the analyte solution.