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Question
20ml of lubricating oil was dissolved in alcohol The solution was titrated against 0.1 N KOH solution. At the end point the burette reading was found to be 2. 5ml calculate the acid value of the oil. ( density of oil= 0.86 g/ml)
Solution
Given data :- Normality of KOH = 0. 1N
Volume of KOH = 2.5 ml
Density of oil = 0.86g/ml
Volume of oil = 20m/.
To find :- Acid value of oil
Formula :- Acid value =`("Vol. of KOH xx Normality of KOH xx 56")/("Weight of oil")`
Solution :- weight of oil = Density x Volume
= 0.86 x 20
= 17.2gms.
Acid value =`("Vol of KOH xx Normality xx 56")/("Weight of oil")`
=`(2.5 xx 0.1 xx 56)/17.2`
= 0.814mg
∴ Acid value = 0.814 mg/ gm of the oil.
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