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Which of the following is a typical soap molecule?

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Which of the following is a typical soap molecule?

(a) Calcium stearate

(b) Potassium permanganate

(c) Sodium bicarbonate

(d) Sodium stearate

This question was addressed to me in an interview for job.

Question is taken from Soaps in chapter Industrially Important Materials of Engineering Chemistry II

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Right answer is (d) Sodium stearate

Easiest explanation: Sodium stearate is a typical soap molecule. Sodium stearate is the sodium salt of stearic acid. Sodium stearate has both hydrophilic and hydrophobic parts, the carboxylate and the long hydrocarbon chain, respectively.

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