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 bak·ing soda /ˈbekɪŋ-/ 名詞

 So·da n.
 1. Chem. (a) Sodium oxide or hydroxide. (b) Popularly, sodium carbonate or bicarbonate.  Sodium bicarbonate is also called baking soda
 Caustic soda, sodium hydroxide.
 Cooking soda, sodium bicarbonate. [Colloq.]
 Sal soda. See Sodium carbonate, under Sodium.
 Soda alum Min., a mineral consisting of the hydrous sulphate of alumina and soda.
 Soda ash, crude sodium carbonate; -- so called because formerly obtained from the ashes of sea plants and certain other plants, as saltwort (Salsola). See under Sodium.
 Soda fountain, an apparatus for drawing soda water, fitted with delivery tube, faucets, etc.
 Soda lye, a lye consisting essentially of a solution of sodium hydroxide, used in soap making.
 Soda niter. See Nitratine.
 Soda salts, salts having sodium for the base; specifically, sodium sulphate or Glauber's salts.
 Soda waste, the waste material, consisting chiefly of calcium hydroxide and sulphide, which accumulates as a useless residue or side product in the ordinary Leblanc process of soda manufacture; -- called also alkali waste.
 Washing soda, sodium carbonate. [Colloq.]
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 Sodium bicarbonate, a white crystalline substance, HNaCO3, with a slight alkaline taste resembling that of sodium carbonate. It is found in many mineral springs and also produced artificially,. It is used in cookery, in baking powders, and as a source of carbonic acid gas (carbon dioxide) for soda water. Called also baking soda, cooking soda, bicarbonate of soda, bicarb, saleratus, and technically, acid sodium carbonate, sodium acid carbonate, primary sodium carbonate, sodium dicarbonate, etc.
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 baking soda
      n : a white soluble compound (NaHCO3) used in effervescent
          drinks and in baking powders and as an antacid [syn: bicarbonate
          of soda, sodium hydrogen carbonate, sodium
          bicarbonate, saleratus]