A solution of citric acid of unknown concentration, prepared in deionized water, is titrated with standardized sodium hydroxide solution, also in deionized water. A few drops of phenolphthalein is added to visualize the pH change. Phenolphthalein changes color from colorless to pink between pH of 7 - 9. What is the titrant in this titration?

According to the question, the color of the solution changed from colorless to pink. This observation indicates that the base is added to the solution i.e., the base is present in the burette. The solution that is present in the burette in a titration experiment is referred as titrant.

Phenolphthalein is itself an acid and act as an indicator. Its color changes from colorless to pink when it loses a proton. This loss of proton is due to the addition of base.

adefioyelaoye adefioyelaoye · Answer 2 · 2022-02-03T14:12:10+01:00

Sodium hydroxide solution is referred to as the titrant

What is a Titrant?

This is a solution whose concentration is known and is usually

added to the other which has an unknown concentration.

We were told that the color of the solution changed from

colorless to pink. This means that the substance in the burette

was added to the solution. Phenolphthalein is an acid and also

act as an indicator which turns pink in basic solutions.

This is why the titrant will be a base and the perfect match will

be Sodium hydroxide solution.

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