a white crystalline solid, NaHCO3, soluble in water and slightly soluble in ethanol; monoclinic; r.d. 2.159; loses carbon dioxide above 270°C
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Niiskes õhus laguneb NaHCO3 aeglaselt juba toatemperatuuril, kuumas vees eraldub CO2 tormiliselt; samuti ka kuumutamisel 50−100 °C juures. ... Sel omadusel põhineb NaHCO3 kasutamine küpsetuspulbrite koostises taigna kergitusainena.
Küpsetuspulber on kergitusaine (juuretis), mis koosneb naatriumvesinikkarbonaadist (söögisooda) ja nõrgast happest, mida on vaja taina/küpsetise kerkimiseks.
Sodium hydrogencarbonate reacts with acids to give carbon dioxide and, as it does not have strongly corrosive or strongly basic properties itself, it is employed in bulk for the treatment of acid spillage and in medicinal applications as an antacid. Sodium hydrogencarbonate is also used in baking powders (and is known as baking soda), dry-powder fire extinguishers, and in the textiles, tanning, paper, and ceramics industries.
Sodium bicarbonate, also called sodium hydrogen carbonate, or bicarbonate of soda, NaHCO3, is a source of carbon dioxide and so is used as an ingredient in baking powders, in effervescent salts and beverages, and as the main constituent of dry-chemical fire extinguishers.
Modern baking powders are combinations of baking soda (sodium bicarbonate) and dry acids or acid salts, usually with starch added for stability in storage.
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