Good quality of sodium carbonate light and dense from Chinese
Sodium carbonate (also known as washing soda, soda ash and soda crystals, and in the monohydrate form as crystal carbonate), Na2CO3, is the water-soluble sodium salt of carbonic acid.
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Soda ash is used as a water softener in laundering: it competes
with the magnesium and calcium ions in hard water and prevents them
from bonding with the detergent being used, but doesn't prevent scaling. Sodium carbonate can be used to remove grease, oil, and wine
In dyeing with fiber-reactive dyes, sodium carbonate (often under a name
such as soda ash fixative or soda ash activator) is used to ensure
proper chemical bonding of the dye with cellulose (plant) fibers,
typically before dyeing (for tie dyes), mixed with the dye (for dye
painting), or after dyeing (for immersion dyeing).
By far the largest consumption of sodium carbonate is in the
manufacture of glass, paper, rayon, soaps, and detergents. It is
also used as a water softener, since carbonate can precipitate the
calcium and magnesium ions present in "hard" water.
Sodium carbonate is a food additive (E500) used as an acidity
regulator, anticaking agent, raising agent, and stabilizer. It is
one of the components of kansui , a solution of alkaline salts used to give ramen noodles their characteristic flavor and texture. It is also used
in the production of snus (Swedish-style snuff) to stabilize the pH of the final product.
Sodium carbonate is also used in the production of sherbet powder. The cooling and fizzing sensation results from the
endothermic reaction between sodium carbonate and a weak acid,
commonly citric acid, releasing carbon dioxide gas, which occurs when the sherbet is
moistened by saliva.
In China, it is used to replace lye-water in the crust of
traditional Cantonese moon cakes, and in many other Chinese steamed buns and noodles.
Sodium carbonate is used by the brick industry as a wetting agent
to reduce the amount of water needed to extrude the clay.
In casting, it is referred to as "bonding agent" and is used to
allow wet alginate to adhere to gelled alginate.
Sodium carbonate is used in toothpastes, where it acts as a foaming
agent and an abrasive, and to temporarily increase mouth pH.
Sodium carbonate is used by the cotton industry to neutralize the
sulfuric acid needed for acid delinting of fuzzy cottonseed.
Sodium carbonate, in a solution with common salt, may be used for
cleaning silver. In a nonreactive container (glass, plastic, or
ceramic), aluminium foil and the silver object are immersed in the
hot salt solution. The elevated pH dissolves the aluminium oxide
layer on the foil and enables an electrolytic cell to be established. Hydrogen ions produced by this reaction reduce
the sulfide ions on the silver restoring silver metal. The sulfide
can be released as small amounts of hydrogen sulfide. Rinsing and
gently polishing the silver restores a highly polished condition.
Sodium carbonate is used in some aquarium water pH buffers to maintain a desired pH and carbonate hardness