moleculefinder

Sodium carbonate

CNa2O3105.988 g/mol Calculated

Also called washing soda, soda and soda ash.

Washing soda: the water softener in laundry powder, the flux that lets glass melt at a workable temperature, and a common pH raiser for pools.

Sources and notes
  • The introductionfrom sourceMoleculeFinder curated
  • Other namesfrom sourceWikidataIts English label and aliases on Wikidata.
  • Formula and weightcomputedPubChem
  • 2D drawingcomputedPubChem structure, drawn by RDKit

Where you encounter it

Sodium carbonate on our curated lists, and on the product labels we hold.

Medicines

FoundayoAdded by the makerInactive ingredient
Mylanta Spiced Apple CiderAdded by the makerInactive ingredient
NicoretteAdded by the makerInactive ingredient
TrexallAdded by the makerInactive ingredient

Household

Household cleanersAdded by the maker

Every product and list we hold

Sources and notes
  • Our curated lists and their amountsfrom sourceMoleculeFinder curatedEach amount is an editorial figure from our food and drink lists, not a measurement of any one product.
  • The product labels and their strengthsfrom sourceDailyMed (FDA label)Each label lists the molecule as an ingredient, and an active ingredient at the strength shown.
  • How it gets therefrom sourceMoleculeFinder curatedEach mark is set by hand on our lists, never inferred; a label's ingredient is added by the maker. A row with no mark data says Not marked.

Explore its structure

Choose a part to light it up.

Two oxygens each carrying a negative charge, each balanced by a sodium ion. Baking soda has a hydrogen on one of them.

From: standard chemistry; NaHCO3 against Na2CO3, as the baking soda vs washing soda page says.

Sources and notes
  • The drawingcomputedPubChem structure, drawn by RDKitThe page's one shipped drawing, with the chosen part lit in amber under it.
  • The partsfrom sourceMoleculeFinder curatedEach part is found by a chemical pattern, never picked by hand atom by atom; its words say where they come from.

Compare a related molecule

Sodium bicarbonate

Sodium carbonate

Sodium bicarbonate is baking soda, mildly alkaline and edible, while sodium carbonate is washing soda, strongly alkaline and used for laundry and grease.

Sodium bicarbonate vs Sodium carbonate, side by side
Sources and notes
  • The sentencefrom sourceMoleculeFinder comparison notesThe pair's answer line.
  • The two drawingscomputedPubChem structures, drawn by RDKitThe two drawings side by side.

Properties and sources

Calculated by PubChem

Molecular formula
CNa2O3
Molecular weight
105.988 g/mol
Polar surface areatopological
63.2 Ų
H-bond donors
0
H-bond acceptors
3
Rotatable bonds
0
Complexity
18

Measured LD50, HSDB via PubChem

2,800 mg/kg pure sodium carbonate, rat, oral

An LD50 is an animal study measurement, not a dose for a person.

Reported Hazard label (GHS), ECHA, EU CLP Regulation, Safe Work Australia, HSDB via PubChem

Danger Corrosive pictogram (GHS05) and Irritant pictogram (GHS07); hazard statements H318, H319, H335

Groups it belongs to

Category
Everyday chemistry
Family
Inorganic compounds
Product lists
Household cleaners
Elements
Sodium
Hazard classes
Corrosive, Irritant, GHS Danger
SMILESC(=O)([O-])[O-].[Na+].[Na+]

PubChem CID 10340 · Wikidata Q190227 · InChIKey CDBYLPFSWZWCQE-UHFFFAOYSA-L · Data refreshed

How MoleculeFinder sources and labels its data

Questions
What is Sodium carbonate?
Washing soda: the water softener in laundry powder, the flux that lets glass melt at a workable temperature, and a common pH raiser for pools.
Where is Sodium carbonate found?
Sodium carbonate is in these product groups: household cleaners. from source
How toxic is Sodium carbonate?
The reported LD50 of Sodium carbonate is 2,800 mg/kg (rat, oral). An LD50 is an animal study measurement, not a dose for a person. Its GHS hazard label carries the signal word Danger and the hazard pictograms Corrosive and Irritant. from sourcefrom source
What kind of molecule is Sodium carbonate?
Sodium carbonate has the formula CNa2O3 and a molecular weight of 105.988 g/mol. MoleculeFinder files it under inorganic compounds, in the everyday chemistry group. from sourcefrom sourcefrom sourcefrom source
What else is Sodium carbonate called?
Sodium carbonate is also called washing soda, soda and soda ash. from source
Sources and notes
  • Calculated valuescomputedPubChemComputed from the structure, so no laboratory conditions apply; complexity is PubChem's own structural score.
  • LD50from sourceHSDB via PubChemOther values the sources report: rat, oral, 4,090 mg/kg. The page shows the one LD50 the site uses everywhere.
  • Hazard labelfrom sourceECHA, EU CLP Regulation, Safe Work Australia, HSDB via PubChemThe label combines these classifications.
  • ECHAfrom sourceAttributionSource: European Chemicals Agency, echa.europa.eu.
  • EU CLP Regulationfrom sourceAttributionSource: EUR-Lex, Regulation (EC) No 1272/2008, © European Union.
  • Safe Work Australiafrom sourceAttributionSource: Safe Work Australia, Hazardous Chemical Information System, © Commonwealth of Australia, CC BY 4.0.
  • Data refreshedfrom sourceMoleculeFinder2026-11-09

Keep exploring

Compared side by side with sodium carbonateSodium bicarbonateCHNaO3A close match in shapeCalcium carbonateCCaO3A close match in shapeMagnesium carbonateCMgO3A close match in shapeAmmonium carbonateCH8N2O3
More related molecules
Sources and notes
  • Compared side by sidefrom sourceMoleculeFinder comparison notesA molecule we compare it with on its own page.
  • Similar in shapecomputedRDKit Morgan/TanimotoNeighbours by structural fingerprint; the sentence names the chemical groups the two share.
  • The drawingscomputedPubChem structures, drawn by RDKit