sodium carbonate

American  

noun

Chemistry.

1. Also called soda ash.  an anhydrous, grayish-white, odorless, water-soluble powder, Na 2 CO 3 , usually obtained by the Solvay process and containing about 1 percent of impurities consisting of sulfates, chlorides, and bicarbonates of sodium: used in the manufacture of glass, ceramics, soaps, paper, petroleum products, sodium salts, as a cleanser, for bleaching, and in water treatment.

2. Also called sal soda, soda, washing soda.  the decahydrated form of this salt, Na 2 CO 3 ⋅10H 2 O, used similarly.

3. the monohydrated form of this salt, Na 2 CO 3 ⋅H 2 O, used similarly, especially in photography.

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sodium carbonate British  

noun

1. a colourless or white odourless soluble crystalline compound existing in several hydrated forms and used in the manufacture of glass, ceramics, soap, and paper and as an industrial and domestic cleansing agent. It is made by the Solvay process and commonly obtained as the decahydrate (washing soda or sal soda) or a white anhydrous powder (soda ash). Formula: Na 2 CO 3 See also washing soda sal soda soda ash

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Etymology

Origin of sodium carbonate

First recorded in 1865–70

Compare meaning

How does sodium-carbonate compare to similar and commonly confused words? Explore the most common comparisons:

• sodium carbonate vs. sodium bicarbonate

Example Sentences

The Met's Cdr Jon Savell said a laboratory analysis of the substance from the attack site found it was a "very strong concentrated corrosive substance, either liquid sodium hydroxide or liquid sodium carbonate".

From BBC • Feb. 4, 2024

Washing soda is the common name for a hydrate of sodium carbonate containing 10 water molecules; the systematic name is sodium carbonate decahydrate.

From Textbooks • Feb. 14, 2019

He’s something of a health nut who avoids chemicals, even such harmless ones as sodium carbonate.

From Washington Post • Aug. 4, 2016

In ancient Egypt, a paste made out of honey, sodium carbonate, and crocodile dung was a popular form of contraception.

From Time • Jan. 23, 2015

Antimony compounds when heated on charcoal with sodium carbonate in the reducing flame give brittle beads of metallic antimony, and a white incrustation of the oxide.

From Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" by Various