soda ash

noun Chemistry.
sodium carbonate ( def 1 ).

Origin:
1830–40

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soda ash
 
n
the anhydrous commercial form of sodium carbonate

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Also, the company would not need to purchase soda ash to enable production of
  lithium carbonate, as is typically done today.
Dipping a shirt in soda ash prior to dyeing helps retain the color.
Tools can be dried by baking in an oven, desiccating in a vacuum, or rubbing
  with anhydrous dry soda ash.
Adding a supplemental source of alkalinity, such as lime or soda ash, may be
  necessary for proper floc formation.
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