一、化学名：碳酸钠;纯碱
　　二、分子式：cna2o3
　　三、分子量：105.99
　　四、cas: 497-19-8
　　五、性状：无水物为白色结晶性粉末，相对密度2.53，熔点851℃，加热至400℃时分解。不溶于乙醇，易溶于水，溶解时放热，水溶液呈强碱性。在空气中极易潮解结块，并吸收co2生成碳酸氢钠。一水物为白色细小结晶或粉末，相对密度1.55。常温稳定，加热至100℃时失去结晶水成为无水物。十水碳酸钠为无色透明结晶，熔点34℃，相对密度(20℃)1.44，在空气中易风化。
　　六、用途：是重要的化工原料之一, 用于制化学品、清洗剂、洗涤剂、也用于照像术和制医药品。
　　七、包装：净重25kg，复合牛皮纸袋内衬聚氯乙烯袋。
　　八、储运与运输：应贮在阴凉、干燥、通风清洁的库房中，轻装轻放，防止受潮、受热，运输过程中防止雨淋受潮，应与有毒物品隔离堆放。
质量指标
specification
gb 1886－92
总碱量(以na2co3计)≥       
content (na2co3)
99.2%
氯化物(以nacl计)≤
nacl
0．7%
(以fe2o3计) ≤
fe
0.004%
水不溶物≤
water insoluble matter
0.04%
灼烧失重≤
loss on ignition
0.8%
砷(以as计)≤
as
0.0002%
重属(以pb计)≤
pb
0.001%
1、chemical name: sodium carbonate
　　2、molecular formula:cna2o3
　　3、molecular weight: 105.99
　　4、cas: 497-19-8
　　5、character: anhydrous is a white crystalline powder, relative density 2.53, melting point 851 ℃, heated to 400 ℃ decomposition. insoluble in ethanol, soluble in water, dissolved when heat, solution is strongly alkaline. easily deliquescence agglomeration in the air, absorb co2 and produce sodium bicarbonate. monohydrate as a fine white crystal or powder, the relative density of 1.55. stable at room temperature and heated to lose crystal water becomes anhydrous at 100 ℃. decahydrate colorless transparent crystallization temperature 34 ℃, relative density (20 ℃) 1.44, in the air easily weathered.
　　6、usage: it is one of the important chemical raw materials used in making chemicals, cleaning agents, detergents, but also for photography and manufacturing pharmaceuticals products.
　　7、packing: it is packed with polythene bag as the inner layer, and a compound plastic woven bag as the outer layer. the net weight of each bag is 25kg.
　　8、storage and transport: it should be stored in a dark, dry and ventilative warehouse, kept away from water and moisture; unloaded with care to avoid damage. furthermore, it must be stored separately from poisonous substances.

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