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Find the acid value of the vegetable oil whose 10ml required 4.0ml of 0.01N KOH during titration (d = 0.92).

(a) 0.243mg

(b) 2.43mg

(c) 24.3mg

(d) 243mg

I had been asked this question at a job interview.

Question is from Saponification Value in chapter Lubricants of Applied Chemistry

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Right answer is (a) 0.243mg

To explain I would say: To find out the acid value of an oil we know the formula, acid value= (volume of KOH*N KOH*56)/wt of the oil in mg. Wt of the oil can be known by calculating the product of density and volume to get 9.2gm. Substitute the values in formula to get 0.243mg as the answer.

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