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The oil blend was analyzed for its acid value .5 mi of oil required 2.5 ml of N/100 KOH. Find its acid value .State whether the blend can still be useful for lubrication.(density of oil is o.89)
Weight of oil = volume of oil in ml X density
= 5 X 0.89
= 4.45 gm
Acid value = Volume of KOH X N KOH X 56 /weight of oil
= 2.5 x 0.01 x 56 /4.45
= 0.315 mg of KOH /gm of oil
As acid value is more than 0.1 mg/gm oil is not suitable for lubrication.
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