Discussion
A mineral lubricating oil should show a saponification value of essentially
Answer: B
Correct answer: zero, containing no glycerides
Saponification acts on esters, and a mineral oil is a mixture of hydrocarbons with no ester groups at all, so it consumes essentially no alkali. A measurable value in a mineral oil therefore indicates either a fatty oil blended in as an additive or oxidation products formed in service.
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