Lesson 4

Lubricants

Topics

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    1 Numerical based on acid value : A vegetable oil was tested for its acid value, 10 gm of oil required 0.2 mi of KOH.

    A vegetable oil was tested for its acid value, 10 gm of oil required 0.2 mi of KOH. Find its acid value. Also mention can it be useful for lubrication.(Normality of KOH =0.02 N)

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    2 Numerical based on acid value :The oil blend was analyzed for its acid value .5 mi of oil required 2.5 ml of N/100 KOH.

    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)

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    3 Numerical based on acid value :Find Acid value of vegetable oil whose 5 ml requires 2ml of N/100 KOH during titration.

    Find Acid value of vegetable oil whose 5 ml requires 2ml of N/100 KOH during titration. State whether the blend can still be useful for lubrication. (density of oil is o.89)

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    4 Numerical based on saponification value : 5 gm of vegetable oil was saponified using excess alcoholic KOH (0.5 N).

    5 gm of vegetable oil was saponified using excess alcoholic KOH (0.5 N). The mixture required 15 ml of 0.05 N HCl While blank titration required 45 ml of HCl. Find the Saponification value of oil. Weight of oil 5 gm

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    5 Numerical based on saponification value : 5 gm of oil was saponified with 50 ml of 0.5 alcoholic KOH.

    5 gm of oil was saponified with 50 ml of 0.5 alcoholic KOH. After refluxing for 2 hours , the mixture was titrated by 15 ml of 0.5 N HCl Find sap value

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    6 Under which conditions use of semi solid lubricants is preferred?

    OR Define grease under which situation it is used as lubricant?

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    8 Explain significance and properties of following:

    Viscosity and Viscosity index

    Acid value of oil

    Cloud and pour point

    Flash and fire point

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