Baking Soda

« Back to Glossary Index

Sodium bicarbonate. A very alkaline (pH9) ingredient often used as an abrasive agent in toothpaste and in rinses for acidic mouths.

Baking Soda (Wikipedia)
Sodium bicarbonate
Ball and stick model of a sodium cation
Ball and stick model of a bicarbonate anion
Sample of sodium bicarbonate
IUPAC name
Sodium hydrogen carbonate
Other names
Baking soda, bicarbonate of soda, nahcolite
144-55-8 YesY
ChEBI CHEBI:32139 YesY
ChemSpider 8609 YesY
DrugBank DB01390 YesY
EC Number 205-633-8
Jmol 3D image Interactive graph
KEGG C12603 YesY
MeSH Sodium+bicarbonate
PubChem 516892
RTECS number VZ0950000
Molar mass 84.0066 g mol−1
Appearance White crystals
Odor odorless
Density 2.20 g/cm3 as a solid

1.1 to 1.3 as a powder

Melting point 50 °C (122 °F; 323 K) (decomposes to sodium carbonate)
9 g/100 mL

69 g/L (0 °C)
96 g/L (20 °C)
165 g/L (60 °C)
236 g/L (100 °C)

Solubility 0.02 %wt acetone, 2.13 %wt methanol @22 °C. insoluble in ethanol
log P -0.82
Acidity (pKa) 10.329

6.351 (carbonic acid)

87.61 J/mol K
102 J/mol K
-947.7 kJ/mol
-851.9 kJ/mol
B05CB04 (WHO) B05XA02, QG04BQ01
Intravenous, oral
Main hazards Causes serious eye irritation
Safety data sheet External MSDS
NFPA 704
Flammability code 0: Will not burn. E.g., waterHealth code 0: Exposure under fire conditions would offer no hazard beyond that of ordinary combustible material. E.g., sodium chlorideReactivity code 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g., calciumSpecial hazards (white): no codeNFPA 704 four-colored diamond
Flash point incombustible
Lethal dose or concentration (LD, LC):
4220 mg/kg ( rat, oral )
Related compounds
Other anions
Sodium carbonate
Other cations
Ammonium bicarbonate

Potassium bicarbonate

Related compounds
Sodium bisulfate

Sodium hydrogen phosphate

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
YesY verify (what is YesYN ?)
Infobox references

Sodium bicarbonate (IUPAC name: sodium hydrogen carbonate) is a chemical compound with the formula NaHCO3. It is a salt composed of sodium ions and bicarbonate ions. Sodium bicarbonate is a white solid that is crystalline but often appears as a fine powder. It has a slightly salty, alkaline taste resembling that of washing soda (sodium carbonate). The natural mineral form is nahcolite. It is a component of the mineral natron and is found dissolved in many mineral springs. It is among the food additives encoded by European Union, identified as E 500.

Since it has long been known and is widely used, the salt has many related names such as baking soda, bread soda, cooking soda, and bicarbonate of soda. The word saleratus, from Latin sal æratus meaning "aerated salt", was widely used in the 19th century for both sodium bicarbonate and potassium bicarbonate.

« Back to Glossary Index