• 中文名称：碳酸钠
• 英文名称：Sodium carbonate
• CAS No.：497-19-8
• 分子式：CNa2O3同分异构体
• 分子量：105.988
• EINECS号：207-838-8; 272-489-0; 231-420-4
• 类别：无机碱 无机盐 漂白剂 化妆品原料

密度：0.47? (loose weight)(lit.)

熔点：3110 deg F

沸点：4046 deg F

折射率：1.535

闪光点：169.8°C

PSA：63.19000

logP：-2.44700

溶解度：22 g/100 mL (20 oC)

Λ：λ: 260 nm Amax: 0.01λ: 280 nm Amax: 0.01

外观：白色无臭粉末

存储：1.贮存于阴凉、干燥、通风良好的库房。

化学性质：Sodium carbonate is a white, crystalline and hygroscopic powder with a purity of > 98 %. There are two forms of sodium carbonate available, light soda and dense soda. Impurities of sodium carbonate may include water (< 1.5 %), sodium chloride (< 0.5 %), sulphate (< 0.1 %), calcium (< 0.1 %), magnesium (< 0.1 %) and iron (< 0.004 %). The purity and the impurity profile depends on the composition of the raw materials, the production process and the intended use of the product. For example the purity of the pharmaceutical grade must be higher than 99.5 % in Europe.Sodium carbonate is a strong alkaline compound with a pH of 11.6 for a 0.1M aqueous solution (The Merck Index, 1983; Johnson and Swanson, 1987). The pKa of CO3 2- is 10.33, which means that at a pH of 10.33 both carbonate and bicarbonate are present in equal amounts.

物理属性：Sodium carbonate is an inorganic salt and therefore the vapour pressure can be considered negligible. It has a melting point of 851°C (CRC Handbook, 1986; The Merck Index, 1983), it decomposes when heated at > 400 °C and therefore a boiling point cannot be determined. soluble in water; insoluble in alcohol; dissolves in acids liberating CO2.The octanol water partition coefficient (log Pow) is not relevant for an inorganic substance which dissociates. The average particle size diameter (d50) of light sodium carbonate is in the range of 90 to 150 μm and of dense sodium carbonate is in the range of 250 to 500 μm.

颜色：单斜针状结晶，白色粉末，味涩。

分解：The carbonate of sodium ... in contact with fluorine /is/ ... decomposed at ordinary temp with incandescence.

气味：Odorless

pH值：Aqueous solutions are strongly alkaline. At 25 deg C, the pH of 1, 5 and 10 wt% sodium carbonate solutions are 11.37, 11.58 and 11.70, respectively

.物理属性：无水碳酸钠的纯品是白色粉末或细粒。 易溶于水，水溶液呈强碱性。微溶于无水乙醇，不溶于丙酮。

酸度系数（pka）：(1) 6.37, (2) 10.25 (carbonic (at 25℃)

溶解性：溶于水，微溶于无水乙醇， 不溶于丙醇， 溶于甘油。

光谱特性：Index of Refraction: 1.535

稳定性：1.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。按规格使用和贮存，不会发生分解，避免与氧化物接触。工作人员应作好防护，若不慎触及皮肤和眼睛，应立即用大量的流动清水冲洗。易溶于水，有吸湿性，十水合碳酸钠是无色单斜晶系柱状结晶，密度为1.45g/cm3，34～34.5℃时会溶解于结晶水，40～50℃干燥时成粉末。 2. 其水溶液水解呈碱性， 有一定的腐蚀性， 能与酸进行中和反应， 生成相应的盐并放出二氧化碳。高温可分解， 生成氧化钠和二氧化碳。长期暴露在空气中能吸收空气中的水分及二氧化碳生成碳酸氢钠， 并结成硬块。存储温度：2-8°C