At what point is a base no longer added during a titration? when the ph increases suddenly in the flask when the phenolphthalein remains clear in the flask before the solution in the flask reaches the equivalency point before half of the base is completely drained from the burette

Option (a) is the correct answer.

Explanation:

The relation between pH and concentration of hydrogen ions is as follows.

              pH =

or,         pH =

At the equivalence point concentration of hydrogen ions equal hydroxide ions. Or, we can say concentration of hydrogen ions = 0.

Therefore,  pH =

                         =

                  pH  = infinity

Hence, there will be sudden increase in pH. Thus, we can conclude that when the pH increases suddenly in the flask then a base is no longer added during a titration.

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