LIPIDS. Classification of lipids. Triglycerides or triacylglycerol Waxes Phospholipids or Phosphoglycerides Steroids. Triacylglyerol. Fats : triglycerides which are solid at room temperature ( most saturated triglycerides, e.g. beef, fat, or lard)
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Fats : triglycerides which are solid at room temperature ( most saturated triglycerides, e.g. beef, fat, or lard)
Oils : triglycerides which are liquid at room temperature ( most triglycerides with several unsaturation, e.g. corn oil, peanut oil, or fish oils)
Tristearin, a fat
NOTE : chemically a soap is the sodium or potassium salt of a fatty acid.
Soaps are useful cleaning agents because of the different affinities of a soap molecule’s two end.
The usefulness of soaps as cleaning agents is limited by their tendency to precipitate out of solution in “hard” water. Hard water is water that is acidic or that contains ions of calcium, magnesium, or iron.
2 CH3(CH2)16COONa + Ca2+ (CH3(CH2)16COO)2Ca + 2 Na+