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What is the molecular formula of stearate ion?

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What is the molecular formula of stearate ion?

(a) C17H35COO^–

(b) C35H17COO^+

(c) C35H17COO^–

(d) C17H35COO^+

The question was posed to me in examination.

The question is from Micelles topic in chapter Materials and their Properties of Engineering Chemistry I

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Right answer is (a) C17H35COO^–

Best explanation: Sodium stearate ionises to form stearate anion(C17H35COO^–) and sodium cation(Na^+).

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