potassium hydrogen carbonate
potassium acid carbonate
3D model (JSmol)
|Molar mass||100.115 g/mol|
|Melting point||292 °C (558 °F; 565 K) (decomposes)|
|33.7 g/100 mL (20 °C) |
60 g/100 mL (60 °C)
|Solubility||practically insoluble in alcohol|
6.351 (carbonic acid)
Std enthalpy of
|Safety data sheet||MSDS|
|R-phrases (outdated)||R36 R37 R38|
|Lethal dose or concentration (LD, LC):|
LD50 (median dose)
|> 2000 mg/kg (rat, oral)|
Potassium hydrogen phosphate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Potassium bicarbonate (also known as potassium hydrogen carbonate or potassium acid carbonate) is a colorless, odorless, slightly basic, salty substance. According to the U.S. Food and Drug Administration (FDA), potassium bicarbonate is "generally recognized as safe". There is no evidence of human carcinogenicity, no adverse effects of overexposure, and an undetermined LD50. Even so, potassium chloride has an oral LD50 of 2.5g/kg, and an intravenous one of 30mg/kg. It is among the food additives encoded by European Union, identified by the E number E501. Physically, potassium bicarbonate occurs as a crystal or a soft white granular powder. Potassium bicarbonate is very rarely found in its natural form, the mineral called kalicinite.
Decomposition of the bicarbonate occurs between 100 and 120 °C (212 and 248 °F):
- K2CO3 + CO2 + H2O → 2 KHCO3
Potassium bicarbonate is used as a fire suppression agent ("BC dry chemical") in some dry chemical fire extinguishers, as the principal component of the Purple-K dry chemical, and in some applications of condensed aerosol fire suppression. It is the only dry chemical fire suppression agent recognized by the U.S. National Fire Protection Association for firefighting at airport crash rescue sites. It is about twice as effective in fire suppression as sodium bicarbonate.
The word saleratus, from Latin sal æratus meaning "aerated salt", was widely used in the 19th century for both potassium bicarbonate and sodium bicarbonate. The term has now fallen out of common usage.
- Goldberg, Robert N.; Kishore, Nand; Lennen, Rebecca M. (2003). "Thermodynamic quantities for the ionization reactions of buffers in water". In David R. Lide. CRC handbook of chemistry and physics (84th ed.). Boca Raton, FL: CRC Press. pp. 7–13. ISBN 978-0-8493-0595-5. Retrieved 6 March 2011.
- GRAS Notification Program (October 31, 2006). "Potassium bicarbonate". GRAS Substances (SCOGS) Database. US FDA. Archived from the original on March 5, 2011. Retrieved March 5, 2011.
- "Why Your Bottled Water Contains Four Different Ingredients". Time Magazine.
- "Purple-K-Powder". US Naval Research Laboratory. Retrieved 8 February 2012.
- "Use of Baking Soda as a Fungicide".
- "Powdery Mildew - Sustainable Gardening Australia". Archived from the original on 2016-03-03.
- "Organic Fruit Production in Michigan".
- "Efficacy of Armicarb (potassium bicarbonate) against scab and sooty blotch on apples" (PDF).
- "Potassium Bicarbonate Handbook" (PDF). Armand Products Company.