Question

The total acid number of an oil is given by __________

(a) Acid value = (volume of 0.1N KOH taken*56)/(weight of oil used)

(b) Acid value = (volume of 0.01N KOH used*56)/(weight of oil taken)

(c) Acid value = (volume of 0.1N KOH used*56)/(weight of oil taken)

(d) Acid value = (volume of 0.01N KOH taken*56)/(weight of oil used)

The question was posed to me by my college director while I was bunking the class.

This intriguing question originated from Neutralization/Acidic Number in chapter Lubricants of Applied Chemistry

Answer 1

Correct choice is (c) Acid value = (volume of 0.1N KOH used*56)/(weight of oil taken)

For explanation: The total acid number of an oil is given by Acid value= (volume of 0.1N KOH used*56)/(weight of oil taken), where the 0.1 is the maximum value of the oil and 56 is the molecular weight of the KOH.