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Caustic sodaModify Date : 2019-01-21 15:14:20
▣ Caustic Soda
※ Introduction of item
Constellation
(1) It is white translucent solid and has strong deliquescent in air. Specific gravity 2.130, Melting point 318 ° C, Boiling point 1,390 ° C
(2) When dissolved in water, hydrogen is generated while showing strong heat. The aqueous solution is strongly alkaline and may ignite upon dissolution.
(3) A solid and its aqueous solution absorb carbonic acid gas when it is left in the air to become sodium bicarbonate.
(4) Soluble in water, methyl alcohol, ethyl alcohol, glycerin.
(5) solubility (for 100 ml of water) 0 ° C .; 42 g, 20 ° C .; 109 g, 100 ° C .; 100 g, PH; 14.0 (4% aqueous solution), 13.39 (1% aqueous solution), 12.0 (0.04% aqueous solution)
Usage
(1) Ammonia method (Solbay method)
Absorption of ammonia gas into saturated brine is made into ammonia saline solution, which is then inhaled with carbon dioxide gas to form crystals, which are separated by filtration, decomposed by water vapor, soda ash solution, and reacted with lime oil.
(2) electrolysis
After dissolving and refining by acting with sodium carbonate and hydrochloric acid on raw material salt, two electrodes (usually anode is lead, cathode is iron or mercury) are added, and the caustic solution, hydrogen, and chlorine generated through direct current are produced by vacuum steam and centrifugation. do.
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