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Find the acid value of a used lubricating oil sample whose 10 ml required 5 ml of N/50 KOH during titration. (Density of oil=0.91 g/cc).
State whether the oil is suitable for lubrication or not.
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written 3.4 years ago by
teamques10
★ 67k
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Volume of Oil = 10 ml
Density of Oil = 0.91 g/cc
Volume of KOH = 5 ml
Normality of KOH = N/50
So,
Weight of oil = Volume × Density = 10 × 0.91 = 9.1 gms
Now,
$Acid\ value=\dfrac{Volume\ of\ KOH\times{}N_{KOH}\times{}56}{Weight\ of\ oil\ in\ gms}$
$=\dfrac{5\times{}\ 0.02\times{}56}{9.1}$
$=0.615\ mg\ of\ KOH$
Acid Value = 0.615 mgs of KOH
Oil is not suitable for lubrication since its acid value is greater than 0.1 mgs of KOH.
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