This then decomposes into carbon dioxide and water: ![]() Reaction of sodium bicarbonate and an acid: Na 2CO 3 + CO 2 + H 2O → 2NaHCO 3 Decomposition The initial reaction produces sodium carbonate:įurther addition of carbon dioxide produces sodium bicarbonate, which at sufficiently high concentration will precipitate out of solution: NaHCO 3 may be obtained by the reaction of carbon dioxide with an aqueous solution of sodium hydroxide : HCO 3 - + H 2O -> H 2CO 3 + OH - Reaction of sodium hydroxide with carbon dioxide It has a pK a of 6.3 in water which causes aqueous solutions to be mildly alkaline: NaHCO 3 is a salt which consists of the ions Na + and the bicarbonate anion, HCO 3. Na 2CO 3 + CO 2 + H 2O → 2 NaHCO 3 Chemistry Acid-base reactions Sodium bicarbonate precipitates as a solid from this method: Ĭommercial quantities of baking soda are also produced by this method: soda ash, mined in the form of the ore trona, is dissolved in water and treated with carbon dioxide. It is produced on the scale of about 100,000 ton/year (year: 2001). NaHCO 3 is mainly prepared by the Solvay process, which is the reaction of calcium carbonate, sodium chloride, ammonia, and carbon dioxide in water. The natural mineral form is known as nahcolite. It is a component of the mineral natron and is found dissolved in many mineral springs. It has a slight alkaline taste resembling that of sodium carbonate. Sodium bicarbonate is a white solid that is crystalline but often appears as a fine powder. ![]() The term has now fallen out of common usage. ![]() The word saleratus, from Latin sal æratus meaning "aerated salt", was widely used in the 19th century for both sodium bicarbonate and potassium bicarbonate. Because it has long been known and is widely used, the salt has many other names including sodium hydrogencarbonate, sodium bicarb, baking soda, bread soda, cooking soda, bicarb soda or bicarbonate of soda. ![]() Sodium bicarbonate is the chemical compound with the formula NaHCO 3. Sodium hydrogen sulphate sodium hydrogen phosphateĮxcept where noted otherwise, data are given for materials in their standard state (at 25 ☌, 100 kPa) Infobox disclaimer and references
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