Isopropyl alcohol becomes increasingly viscous with decreasing temperature and freezes at −89 ☌ (−128 ☏). It has a slightly bitter taste, and is not safe to drink. Alcohol mixtures have depressed melting points. Isopropyl alcohol forms an azeotrope with water, which gives a boiling point of 80.37 ☌ (176.67 ☏) and a composition of 87.7% by mass (91% by volume) isopropyl alcohol. The process is colloquially called salting out, and causes concentrated isopropyl alcohol to separate into a distinct layer. Unlike ethanol or methanol, isopropyl alcohol is not miscible with salt solutions and can be separated from aqueous solutions by adding a salt such as sodium chloride. It dissolves ethyl cellulose, polyvinyl butyral, many oils, alkaloids, gums and natural resins. Isopropyl alcohol is miscible in water, ethanol, and chloroform.
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