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?

Sodium hydroxide solution is the titrant

Explanation:

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.    

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