Sodium Bicarbonate - Sodium Tansansulfate

NaHCO ₃ (84.01). It is also called baking soda, acidic sodium carbonate, or sodium bicarbonate. It is obtained by passing carbon dioxide through a saturated aqueous solution of sodium carbonate. It is a white monoclinic crystal. Its density is 2.159 g cm ^-3 . Its solubility in 100 g of water is 6.9 g (0 °C) and 16.4 g (60 °C). It is poorly soluble in ethanol. When heated, it decomposes, releasing carbon dioxide and water, and becomes anhydrous sodium carbonate at temperatures above 270 °C (laboratory method for producing carbon dioxide and pure sodium carbonate). The aqueous solution hydrolyzes and becomes slightly alkaline, and when heated to 65 °C or higher, it becomes sodium carbonate. It is used in the production of sodium salts, the generation of carbon dioxide, fire extinguishers, baking powder, the production of carbonated drinks, laundry powder soap, butter preservatives, wood mold inhibitors, medicines, and analytical reagents. There is also sodium sesquicarbonate, NaCO ₃ ･NaHCO ₃ ･2H ₂ O. This is natural soda. It is a white monoclinic crystal, less alkaline than sodium carbonate, and is used for washing wool and woolen fabrics. [CAS 144-55-8]

Source: Morikita Publishing "Chemical Dictionary (2nd Edition)" Information about the Chemical Dictionary 2nd Edition

NaHCO₃(84.01)．重曹，酸性炭酸ナトリウム，重炭酸ナトリウムともいう．炭酸ナトリウムの飽和水溶液に二酸化炭素を通じると得られる．白色の単斜晶系結晶．密度2.159 g cm^－3．水100 g に対する溶解度は6.9 g(0 ℃)，16.4 g(60 ℃)．エタノールに難溶．熱すれば二酸化炭素と水を放って分解し，270 ℃ 以上では炭酸ナトリウム無水物となる(二酸化炭素の実験室的製法，および純炭酸ナトリウムの製法)．水溶液は加水分解して微アルカリ性を示し，水溶液を65 ℃ 以上に熱すると炭酸ナトリウムになる．ナトリウム塩の製造，二酸化炭素の発生，消火器，ベーキングパウダー，炭酸飲料水の製造，洗濯用粉せっけん，バターの防腐剤，木材の防かび剤，医薬品，分析試薬などに用いられる．ほかにセスキ炭酸ナトリウムともよばれるNaCO₃･NaHCO₃･2H₂Oもある．これは天然ソーダである．白色の単斜晶系結晶で，炭酸ナトリウムよりアルカリ性が弱く，羊毛，毛織物の洗濯に用いられる．[CAS 144-55-8]

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