Potassium bicarbonate

Potassium bicarbonate

Chembox new
Name = Potassium bicarbonate
ImageFile = Potassium bicarbonate.jpg
ImageSize = 200px
ImageName = Potassium bicarbonate
IUPACName = potassium hydrogen carbonate
OtherNames = potassium acid carbonate
Section1 = Chembox Identifiers
CASNo = 298-14-6
Section2 = Chembox Properties
Formula = KHCO3
MolarMass = 100.11 g/mol
Appearance = colorless crystals or white powder
Density = 2.17 g/cm3, solid
Solubility = 32.2 g/100 ml (20°C)
MeltingPt = decomposes 100°C-200°C
Section3 = Chembox Structure
CrystalStruct = monoclinic
Section7 = Chembox Hazards
ExternalMSDS = [http://msds.ehs.cornell.edu/msds/msdsdod/a495/m247034.htm Potassium bicarbonate]
Section8 = Chembox Related
OtherCpds = potassium carbonate

Potassium bicarbonate (also known as potassium hydrogen carbonate or potassium acid carbonate), is a colorless, odorless, slightly basic, salty substance. The US Food and Drug Administration (FDA) recognizes potassium bicarbonate as "generally recognized as safe".

Potassium bicarbonate is soluble in water, and is often found added to bottled water to affect taste; however, it is not soluble in alcohol. Decomposition of the substance occurs between 100°C and 120°C into K2CO3 (potassium carbonate), H2O (water), and CO2 (carbon dioxide). In concentrations greater than 0.5%, KHCO3 can have toxic effects on plantsFact|date=April 2008 (potassium bicarbonate has widespread use in crops, especially for neutralizing acidic soil, and is also under consideration as an organic fungicide [FiBL (2006) [http://www.fibl.org/english/news/opinion-papers/2006/0811-bicarbonate.php Use of potassium bicarbonate as a fungicide in organic farming] ] ), although there is no evidence of human carcinogenicity, no adverse effects of overexposure, and an undetermined LD50.

Physically, potassium bicarbonate occurs as a crystal or a soft white granular powder. It has a CAS No [298-14-6] . It is manufactured by reacting potassium carbonate with carbon dioxide and water:

:K2CO3 + CO2 + H2O → 2 KHCO3

Potassium bicarbonate is very rarely found in its natural form, mineral called kalicinite.

Uses

The compound is used as a source of carbon dioxide for leavening in baking, extinguishing fire in powder fire extinguishers, acting as a reagent, and a strong buffering agent in medications.

It is used as a base in foods to regulate pH. It is a common ingredient in club soda, where it is used to soften the effect of effervescence.

Potassium bicarbonate is used as a fire suppression agent ("BC powder") in some dry powder fire extinguishers, as the principal component of the Purple-K powder. It is the only dry chemical fire suppression agent recognized by the National Fire Protection Association for firefighting at airport crash rescue sites. It is about twice as effective in fire suppression as sodium bicarbonate. [http://www.nrl.navy.mil/content.php?P=PURPLEK]

Potassium bicarbonate is an effective fungicide against powdery mildew. [ [http://www.sgaonline.org.au/info_powderymildew.html Powdery Mildew - Sustainable Gardening Australia ] ]

History

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.

References

External links

* [http://www.armandproducts.com/pdfs/PotBiVs6.PDF Potassium Bicarbonate Handbook]
* [http://www.omri.org/Potassium_bicarbonate_crops.pdf Potassium Bicarbonate: Crops]


Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • potassium bicarbonate — n a crystalline salt KHCO3 that gives a weakly alkaline reaction in aqueous solution and is sometimes used as an antacid and urinary alkalizer see klor con * * * [USP] a salt, KHCO3, used as a pharmaceutic necessity and as an electrolyte… …   Medical dictionary

  • potassium bicarbonate — noun a crystalline salt (KHCO3) that is used in baking powder and as an antacid • Syn: ↑potassium acid carbonate, ↑potassium hydrogen carbonate • Hypernyms: ↑bicarbonate, ↑hydrogen carbonate * * * noun or …   Useful english dictionary

  • potassium bicarbonate — kalio hidrokarbonatas statusas T sritis chemija formulė KHCO₃ atitikmenys: angl. potassium acid carbonate; potassium bicarbonate; potassium hydrocarbonate; potassium hydrogen carbonate rus. калий двууглекислый; калий кислый углекислый; калия… …   Chemijos terminų aiškinamasis žodynas

  • potassium bicarbonate — Chem., Pharm. a white, crystalline, slightly alkaline, salty tasting, water soluble powder, KHCO3, produced by the passage of carbon dioxide through an aqueous potassium carbonate solution: used in cookery as a leavening agent and in medicine as… …   Universalium

  • potassium bicarbonate — /pəˌtæsiəm baɪˈkabənət/ (say puh.taseeuhm buy kahbuhnuht) noun a white powder, KHCO3, used in cookery and medicine. Also, potassium hydrogencarbonate …  

  • potassium bicarbonate — noun An odorless, slightly basic substance which is soluble in water and often used to offset acidity …   Wiktionary

  • Bicarbonate de potasium — Bicarbonate de potassium Bicarbonate de potassium Général Synonymes hydrogénocarbonate de potassium …   Wikipédia en Français

  • Bicarbonate de potassium — Général Synonymes hydrogénocarbonate de potassium No CAS …   Wikipédia en Français

  • Potassium hydrogenoxalate — IUPAC name Potassium 2 hydroxy 2 oxoacetate …   Wikipedia

  • Potassium chloride — This article is about the chemical compound. For other uses, see KCL. Potassium chloride …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”