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In determination of saponification value of the oil reaction _______ is unreacted.

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In determination of saponification value of the oil reaction _______ is unreacted.

(a) NaOH

(b) Nacl

(c) KOH

(d) Kcl

The question was asked during an interview for a job.

My question is taken from Saponification Value topic in division Lubricants of Applied Chemistry

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The correct answer is (c) KOH

Explanation: In determination of the saponification value of the oil reaction, KOH is unreacted. The KOH is used as the catalyst and it remains unreacted and then titrated with standard acid using phenolphthalein as an indicator.

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