Chemical Process
Saponification value/number of an oil or fat is a measure of its

Degree of unsaturation of the fatty acids present in it
Average molecular weight
Insoluble fatty acid content
Fatty acid content

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Chemical Process
Use of hydrated lime in water treatment

All of these
After filtration, combats the corrosive-ness of water due to the presence of O₂ & CO₂
Before filtration, reduces the bacterial load on filters
Is to adjust the pH value

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