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That caustic liquid like sodium hydroxide, also known as caustic soda, caustic soda. Caustic soda, liquid and solid industrial products, where the liquid is an aqueous solution of sodium hydroxide different content; solid white opaque, often made of sheets, rods, granular, or molten state to drum packaging. Pure product is colorless and transparent liquid. The relative density of 2.130, melting point 318.4 ℃, boiling point 1390 ℃. Commercially available solid and liquid caustic soda are two: pure solid caustic soda is white, there are flaky, massive, granular and rod, crisp; pure liquid caustic soda is called, it is a colorless transparent liquid. Industrial multi-containing impurities, mainly sodium chloride and sodium carbonate, etc., and sometimes a small amount of iron oxide. When dissolved into a thick liquid caustic soda, the most of the impurities will go up liquid, separable removed. The solid caustic soda has a strong moisture absorption, soluble in water, dissolved when heat, as a solution is strongly alkaline, creamy texture and bitter taste, can make red litmus paper blue, phenolphthalein solution red. Also soluble in ethanol and glycerin, insoluble in acetone, ether, acetic acid. Met with the acid and the role it played from salt and water. Saponified grease has the ability to produce soap and glycerin. Easily absorb carbon dioxide and moisture in the air into carbonates. It occurs with chlorine, bromine, iodine and other halogen disproportionation reaction. Aluminum and zinc metal and non-metallic silicon, boron and other reaction to release hydrogen. Highly corrosive to the skin, fiber, glass, ceramics and so have a corrosive effect. Pure sodium hydroxide is a white crystalline solid opaque feathery, general industrial contain small amounts of sodium chloride and sodium carbonate, slightly pale shiny white crystalline solid. Sodium hydroxide is one of the strongest bases react with acids to form the sodium salt. Sodium hydroxide is very hygroscopic, place the air can absorb a lot of water and caustic soda into deliquescence.