The following plot shows two titration curves,each representing the titration of 50.00 mL of 0.100 M acid with 0.100 M NaOH.
-Which points a-d represent the half-equivalence point and the equivalence point,respectively,for the titration of a weak acid?
A)points a and b
B)points a and c
C)points b and d
D)points c and d

Question

The following plot shows two titration curves,each representing the titration of 50.00 mL of 0.100 M acid with 0.100 M NaOH. 
-Which points a-d represent the half-equivalence point and the equivalence point,respectively,for the titration of a weak acid?
A)points a and b 
B)points a and c 
C)points b and d 
D)points c and d

Quizplus · Accepted Answer

For the titration of a weak acid, the half-equivalence point is the point where half of the acid has been neutralized and its conjugate base has been formed. This occurs at point a, where the pH is equal to the pKa of the weak acid. The equivalence point is the point where all of the acid has been neutralized and converted to its conjugate base. This occurs at point c, where the pH is greater than 7 and is controlled by the strong base NaOH. Therefore, the correct choice is B, which includes point a as the half-equivalence point and point c as the equivalence point for the titration of a weak acid.

The Following Plot Shows Two Titration Curves,each Representing the Titration