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Sodium bicarbonate (IUPAC name: sodium hydrogencarbonate [9]), commonly known as baking soda or bicarbonate of soda, is a chemical compound with the formula NaHCO 3. It is a salt composed of a sodium cation (Na +) and a bicarbonate anion (HCO 3 −). Sodium bicarbonate is a white solid that is crystalline but often appears as a
Sodium sesquicarbonate (systematic name: trisodium hydrogendicarbonate) Na 3 H(CO 3) 2 is a double salt of sodium bicarbonate and sodium carbonate (NaHCO 3 · Na 2 CO 3), and has a needle-like crystal structure.
The bicarbonate ion (hydrogencarbonate ion) is an anion with the empirical formula HCO − 3 and a molecular mass of 61.01 daltons; it consists of one central carbon atom surrounded by three oxygen atoms in a trigonal planar arrangement, with a hydrogen atom attached to one of the oxygens.
The method is appealing to such users because sodium bicarbonate is widely sold as baking soda, and the temperatures required (250 °F (121 °C) to 300 °F (149 °C)) to convert baking soda to sodium carbonate are readily achieved in conventional kitchen ovens. [18]
Intravenous sodium bicarbonate, also known as sodium hydrogen carbonate, is a medication primarily used to treat severe metabolic acidosis. [2] For this purpose it is generally only used when the pH is less than 7.1 and when the underlying cause is either diarrhea , vomiting , or the kidneys . [ 3 ]
It combines with sodium bicarbonate to release carbon dioxide: Na 2 H 2 P 2 O 7 + NaHCO 3 → Na 3 HP 2 O 7 + CO 2 + H 2 O. It is available in a variety of grades that affect the speed of its action. Because the resulting phosphate residue has an off-taste, SAPP is usually used in very sweet cakes which mask the off-taste. [2]
It can substitute for baking soda (sodium bicarbonate) for those with a low-sodium diet, [4] and it is an ingredient in low-sodium baking powders. [5] [6] As an inexpensive, nontoxic base, it is widely used in diverse application to regulate pH or as a reagent. Examples include as buffering agent in medications, an additive in winemaking.
Ammonium bicarbonate is produced by combining carbon dioxide and ammonia: CO 2 + NH 3 + H 2 O → (NH 4)HCO 3. Since ammonium bicarbonate is thermally unstable, the reaction solution is kept cold, which allows the precipitation of the product as white solid.