sodium carbonate 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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 So·di·um n.  Chem. A common metallic element of the alkali group, in nature always occuring combined, as in common salt, in albite, etc. It is isolated as a soft, waxy, white, unstable metal, so highly reactive that it combines violently with water, and to be preserved must be kept under petroleum or some similar liquid. Sodium is used combined in many salts, in the free state as a reducer, and as a means of obtaining other metals (as magnesium and aluminium) is an important commercial product. Symbol Na (Natrium). Atomic weight 22.990.  Specific gravity 0.97.
 Sodium amalgam, an alloy of sodium and mercury, usually produced as a gray metallic crystalline substance, which is used as a reducing agent, and otherwise.
 Sodium carbonate, a white crystalline substance, Na2CO3.10H2O, having a cooling alkaline taste, found in the ashes of many plants, and produced artifically in large quantities from common salt. It is used in making soap, glass, paper, etc., and as alkaline agent in many chemical industries. Called also sal soda, washing soda, or soda.  Cf. Sodium bicarbonate, and Trona.
 Sodium chloride, common, or table, salt, NaCl.
 Sodium hydroxide, a white opaque brittle solid, NaOH, having a fibrous structure, produced by the action of quicklime, or of calcium hydrate (milk of lime), on sodium carbonate. It is a strong alkali, and is used in the manufacture of soap, in making wood pulp for paper, etc. Called also sodium hydrate, and caustic soda. By extension, a solution of sodium hydroxide.

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 Wash·ing, n.
 1. The act of one who washes; the act of cleansing with water; ablution.
 2. The clothes washed, esp. at one time; a wash.
 3. Mining Gold dust procured by washing; also, a place where this is done; a washery.
 4.  A thin covering or coat; as, a washing of silver.
 5.  Stock Exchanges The operation of simultaneously buying and selling the same stock for the purpose of manipulating the market. The transaction is fictitious, and is prohibited by stock-exchange rules.
 6.  Pottery The covering of a piece with an infusible powder, which prevents it from sticking to its supports, while receiving the glaze.
 Washing bear Zool., the raccoon.
 Washing bottle Chem., a bottle fitted with glass tubes passing through the cork, so that on blowing into one of the tubes a stream of water issuing from the other may be directed upon anything to be washed or rinsed, as a precipitate upon a filter, etc.
 Washing fluid, a liquid used as a cleanser, and consisting usually of alkaline salts resembling soaps in their action.
 Washing machine, a machine for washing; specifically, a machine for washing clothes.
 Washing soda. Chem. See Sodium carbonate, under Sodium.
 Washing stuff, any earthy deposit containing gold enough to pay for washing it; -- so called among gold miners.

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 sodium carbonate
      n : a sodium salt of carbonic acid; used in making soap powders
          and glass and paper [syn: washing soda, sal soda, {soda
          ash, soda]