Question

In assay of sodium benzoate which indicator is used? *​

Answer 1

Answer:

1-naphtholbenzein indicator solution is used.

Explanation:

Sodium benzoate is a white granular or crystalline powder that is used as a preservative. When basic sodium benzoate is dissolved in glacial acetic acid, the strength of the weak base sodium benzoate is increased. During the titration with strong acid, acetic acid serves as a base, allowing an accurate endpoint to be calculated. The 1-naphtholbenzein solution is used to detect the reaction's endpoint as an indication. Actual end point of the titration is detected by a transition of the color of solution from violet to emerald green.

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