Question

10 ml of vinegar (mass = 10.05g) requires 16.38 ml of
0.5120 M NaOH to reach end point. Calculate the molarity and mass percent of acetic acid in vinegar.
​

Answer 1

Explanation:

Titration of Vinegar:

A common laboratory experiment that is used to illustrate an acid-base titration is the titration of vinegar. In this titration reaction, we incrementally add NaOH which acts as a titrant to react with the acetic acid present in a solution of vinegar. This is expressed by the balanced chemical equation:

C

H

3

C

O

O

H

(

a

q

)

+

N

a

O

H

(

a

q

)

→

N

a

C

H

3

C

O

O

(

a

q

)

+

H

2

O

(

l

)

At the equivalence point, the phenolpthalein indicator undergoes a color change to indicate that all of the acetic acid has been consumed.