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The triglyceride derived from three molecules of stearic acid is called stearin. [9] Stearic acid is a prevalent fatty-acid in nature, found in many animal and vegetable fats, but is usually higher in animal fat than vegetable fat. It has a melting point of 69.4 °C (156.9 °F) °C and a pKa of 4.50. [11]
Boiling point (°C) K b (°C⋅kg/mol) Freezing point (°C) K f (°C⋅kg/mol) Data source; Aniline: 184.3 3.69 –5.96 –5.87 K b & K f [1] Lauric acid: 298.9 44 –3.9 Acetic acid: 1.04 117.9 3.14 16.6 –3.90 K b [1] K f [2] Acetone: 0.78 56.2 1.67 –94.8 K b [3] Benzene: 0.87 80.1 2.65 5.5 –5.12 K b & K f [2] Bromobenzene: 1.49 156.0 6. ...
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As discovered in the early days of vulcanization, zinc has a beneficial effect on the reaction of the sulfur with the polyolefin. The stearate is a form of zinc that is highly soluble in the nonpolar medium of the polyolefins. Being lipophilic, it functions as a phase transfer catalyst for the saponification of fats. [3]
The melting point (or, rarely, liquefaction point) of a substance is the temperature at which it changes state from solid to liquid. At the melting point the solid and liquid phase exist in equilibrium. The melting point of a substance depends on pressure and is usually specified at a standard pressure such as 1 atmosphere or 100 kPa.
The idealized equation for the formation of sodium stearate from stearin (the triglyceride of stearic acid) follows: (C 18 H 35 O 2) 3 C 3 H 5 + 3 NaOH → C 3 H 5 (OH) 3 + 3 C 18 H 35 O 2 Na. Purified sodium stearate can be made by neutralizing stearic acid with sodium hydroxide. C 17 H 35 COOH+NaOH→C 17 H 35 COONa+H 2 O
Cerium stearate is a metal-organic compound, a salt of cerium and stearic acid with the chemical formula C 54 H 105 CeO 6. [2] [3] The compound is classified as a metallic soap, i.e. a metal derivative of a fatty acid. [4]
Lead stearate is a metal-organic compound, a salt of lead and stearic acid with the chemical formula C 36 H 70 PbO 4. [1] The compound is classified as a metallic soap, i.e. a metal derivative of a fatty acid. [2] The compound is toxic.