Chemical Structure / July 20, 2018 / Isabelle Vinson
Sodium acetate is also used in heating pads, hand warmers, and hot ice. Sodium acetate trihydrate crystals melt at 136.4 °F58 °C (to 137.12 °F58.4 °C), dissolving in their water of crystallization. When they are heated past the melting point and subsequently allowed to cool, the aqueous solution becomes supersaturated. This solution is capable of cooling to room temperature without forming crystals. By pressing on a metal disc within the heating pad, a nucleation center is formed, causing the solution to crystallize back into solid sodium acetate trihydrate. The bond-forming process of crystallization is exothermic.
Cetylpyridinium chloride has the molecular formula C21H38NCl and at its pure form is in a solid state at room temperature. It has a melting point of 77 °C when anhydrous or 80-83 °C in its monohydrate form. It is soluble in water but insoluble in acetone, acetic acid, or ethanol. It has a pyridine-like odor. It is combustible. Concentrated solutions are destructive to mucous membranes. Its critical micelle concentration (CMC) is 0.00012M, and is strongly dependent on the salt concentration of the solution.
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