Sodium bicarbonate. A very alkaline (pH9) ingredient often used as an abrasive agent in toothpaste and in rinses for acidic mouths.
Sodium hydrogen carbonate
Baking soda, bicarbonate of soda, nahcolite
|Jmol 3D image||Interactive graph|
|Molar mass||84.0066 g mol−1|
|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)
|Solubility||0.02 %wt acetone, 2.13 %wt methanol @22 °C. insoluble in ethanol|
6.351 (carbonic acid)
Refractive index (nD)
|87.61 J/mol K|
|102 J/mol K|
Std enthalpy of
Gibbs free energy (ΔfG˚)
|B05CB04 (WHO) B05, QG04|
|Main hazards||Causes serious eye irritation|
|Safety data sheet||External MSDS|
|Lethal dose or concentration (LD, LC):|
LD50 (Median dose)
|4220 mg/kg ( rat, oral )|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
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.