纯碱(碳酸钠)（Sodium carbonate (soda ash)）.docVIP

纯碱(碳酸钠)（Sodium carbonate (soda ash)） Na2CO3 soluble in water, slightly soluble in anhydrous ethanol, insoluble in propanol. Sodium carbonate is soluble in water, is a strong alkali salt, dissolved in water after hydrolysis reaction, so that the solution is alkaline, there is a certain degree of corrosion, and acid can neutralize reaction, produce the corresponding salt, and emit carbon dioxide. Laboratory made sodium carbonate: 2NaOH+CO2=Na2CO3+H2O., a sodium carbonate found in nature (such as saltwater lakes), is known as natural base and used as a detergent and in printing in ancient times. In 1791, sodium carbonate was produced by using salt, sulfuric acid, coal and limestone as raw materials. It was used as Lv Bulan method. This method was gradually replaced by sol dimensional method because of inadequate utilization of raw materials, poor working conditions and poor quality of products. In 1859 Belgium Solvay with salt, ammonia and carbon dioxide as raw material at room temperature to precipitate from solution of sodium bicarbonate, will heat it is decomposed into sodium carbonate, this method has been used to. Used in the manufacture of glass, paper, textiles, detergents. In 1943 Chinese with China mainland Hou te Pang salt conditions, the Solvay process was improved, the soda ash and ammonia two Industry Association, while the production of sodium carbonate and ammonium chloride fertilizer, greatly improves the utilization rate of salt, is for Hous soda process. The main chemical reaction of alkali method and Soxhlet method Hous Soda type are: NaCl + CO2 + NH3 + H2O = NaHCO3 + NH4Cl: NaHCO3 (sodium bicarbonate), soluble only in this condition, the sodium bicarbonate dissolved amount is greater than the solubility of the conditions, so the precipitation of solid sodium bicarbonate, filtered, get solid sodium bicarbonate. 2NaHCO3== Delta CO2 = = = Na2CO3+ + H2O is different in the Soxhlet extraction in the preparation process of NH3 is circular: 2NH4Cl + Ca (OH