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Find acid value of vegetable oil whose 5 ml requires 2 ml of N/100 KOH during lubrication (Density of oil is 0.92 g/ml).
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Volume of Oil=5 ml

Density of Oil=0.92 g/cc

Volume of KOH=2 ml

Normality of KOH=N/100

 

So,

Weight of oil=Volume×Density=5×0.92=4.6 gm

$Acid\ value=\dfrac{Volume\ of\ KOH\times{}N_{KOH}\times{}56}{Weight\ of\ oil\ in\ gm}$

$=\dfrac{2\times{}0.01\times{}56}{4.6}$

$=0.243\ mg\ of\ KOH$

$Acid\ value=0.243\ mg\ of\ KOH$

Oil is not suitable for lubrication since its acid value is greater than 0.1 mg of KOH.

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