Potassium carbonate
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| Names | |
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| IUPAC name
Potassium carbonate
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| Other names
Carbonate of potash, dipotassium carbonate, potcarb, sub-carbonate of potash, pearl ash, pearlash, potash, salt of tartar, salt of wormwood.
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| Identifiers | |
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3D model (JSmol)
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PubChem CID
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| Properties | |
| Page Module:Chem2/styles.css has no content.K2CO3 | |
| Molar mass | 138.205 g·mol−1 |
| Appearance | White, hygroscopic solid |
| Density | 2.43 g/cm3 |
| Melting point | 891 °C (1,636 °F; 1,164 K) |
| Boiling point | Decomposes |
| 110.3 g/(100Template:NnbspmL) (20 °C) 149.2 g/(100Template:NnbspmL) (100 °C) | |
| Solubility | Page Template:Plainlist/styles.css has no content.
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| Acidity (pKa) | 10.25 |
| −59.0·10−6 cm3/mol | |
| Thermochemistry[1] | |
Heat capacity (C)
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114.4 J/(mol·K) |
Std molar
entropy (S⦵298) |
155.5 J/(mol·K) |
Std enthalpy of
formation (ΔfH⦵298) |
−1151.0 kJ/mol |
Gibbs free energy (ΔfG⦵)
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−1063.5 kJ/mol |
| Hazards | |
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| Flash point | Non-flammable |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose)
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1870 mg/kg (oral, rat)[2] |
| Safety data sheet (SDS) | ICSC 1588 |
| Related compounds | |
Other anions
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Other cations
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Related compounds
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Template:Chembox Footer/trackingTemplate:Short description
Potassium carbonate is the inorganic compound with the formula Page Module:Chem2/styles.css has no content.K2CO3. It is a white salt, which is soluble in water and forms a strongly alkaline solution. It is deliquescent, often appearing as a damp or wet solid. Potassium carbonate is used in production of dutch process cocoa powder,[3] production of soap and production of glass.[4] Commonly, it can be found as the result of leakage of alkaline batteries.[5] Potassium carbonate is a potassium salt of carbonic acid. This salt consists of potassium cations Page Module:Chem2/styles.css has no content.K+ and carbonate anions Page Module:Chem2/styles.css has no content.CO2−3, and is therefore an alkali metal carbonate.
History
Script error: No such module "about". Potassium carbonate is the primary component of potash and the more refined pearl ash or salt of tartar. Historically, pearl ash was created by baking potash in a kiln to remove impurities. The fine, white powder remaining was the pearl ash. The first patent issued by the US Patent Office was awarded to Samuel Hopkins in 1790 for an improved method of making potash and pearl ash.[6]
In late 18th-century North America, before the development of baking powder, pearl ash was used as a leavening agent for quick breads.[7][8]
Production
The modern commercial production of potassium carbonate is by reaction of potassium hydroxide with carbon dioxide:[4]
- Page Module:Chem2/styles.css has no content.2 KOH + CO2 → K2CO3 + H2O
From the solution crystallizes the sesquihydrate Page Module:Chem2/styles.css has no content.K2CO3·1.5H2O ("potash hydrate"). Heating this solid above 200 °C (392 °F) gives the anhydrous salt. In an alternative method, potassium chloride is treated with carbon dioxide in the presence of an organic amine to give potassium bicarbonate, which is then calcined:
- Page Module:Chem2/styles.css has no content.2 KHCO3 → K2CO3 + H2O + CO2
Applications
- (historically) for soap, glass, and dishware production;[citation needed]
- as a dietary potassium supplement, containing 56% of elemental potassium,[9] in tablet or powder form to address low blood potassium levels caused by inadequate nourishment, nausea and vomiting, diarrhea, or potassium-depleting medications such as corticosteroids or diuretics;[10][11]
- as a mild drying agent where other drying agents, such as calcium chloride and magnesium sulfate, may be incompatible. It is not suitable for acidic compounds, but can be useful for drying an organic phase if one has a small amount of acidic impurity. It may also be used to dry some ketones; alcohols, and amines prior to distillation.[12]
- in cuisine, where it has many traditional uses. It is used in some types of Chinese noodles and mooncakes, as well as Asian grass jelly and Japanese ramen. German gingerbread recipes often use potassium carbonate as a baking agent.[13]
- in the alkalization of cocoa powder to produce Dutch process chocolate by balancing the pH (i.e., reduce the acidity) of natural cocoa beans; it also enhances aroma—the process of adding potassium carbonate to cocoa powder is usually called "Dutching" (and the products referred to as Dutch-processed cocoa powder), as the process was first developed in 1828 by Dutchman Coenraad Johannes van Houten;[citation needed]
- as a buffering agent in the production of mead or wine;[citation needed]
- in antique documents, it is reported to have been used to soften hard water;[14]
- as a fire suppressant in extinguishing deep-fat fryers and various other oil/fat/grease related fires;[citation needed][citation needed]
- in condensed aerosol fire suppression, although as the byproduct of potassium nitrate;[citation needed]
- as an ingredient in welding fluxes, and in the flux coating on arc-welding rods;[citation needed]
- as an animal feed ingredient to satisfy the potassium requirements of farmed animals such as broiler breeder chickens;[citation needed]
- as an acidity regulator in Swedish snus snuff tobacco.[citation needed]
References
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- ^ Page Module:Citation/CS1/styles.css has no content.CRC handbook of chemistry and physics: a ready-reference book of chemical and physical data. William M. Haynes, David R. Lide, Thomas J. Bruno (2016-2017, 97th ed.). Boca Raton, Florida. 2016. ISBN 978-1-4987-5428-6. OCLC 930681942.
{{cite book}}: CS1 maint: location missing publisher (link) CS1 maint: others (link) - ^ Page Module:Citation/CS1/styles.css has no content.Chambers, Michael. "ChemIDplus - 584-08-7 - BWHMMNNQKKPAPP-UHFFFAOYSA-L - Potassium carbonate [USP] - Similar structures search, synonyms, formulas, resource links, and other chemical information". chem.sis.nlm.nih.gov. Archived from the original on 2014-08-12.
- ^ Page Module:Citation/CS1/styles.css has no content."The Difference Between Natural and Alkalized Cacao Powder and its Uses". Cocoa Supply BV - NL-BIO-01. 14 March 2022. Retrieved 10 August 2025.
- ^ a b Page Module:Citation/CS1/styles.css has no content.H. Schultz; G. Bauer; E. Schachl; F. Hagedorn; P. Schmittinger (2005). "Potassium Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a22_039. ISBN 3-527-30673-0.
- ^ Page Module:Citation/CS1/styles.css has no content.List, Jenny (October 19, 2022). "Crusty Leaking Cells Kill Your Tech. Just What's Going On?". Hackaday. Archived from the original on May 30, 2023.
- ^ Page Module:Citation/CS1/styles.css has no content."Milestones in U.S. patenting". www.uspto.gov. Archived from the original on 2023-03-22. Retrieved 2023-08-04.
- ^ See references to "pearl ash" in "American Cookery" by Amelia Simmons, printed by Hudson & Goodwin, Hartford, 1796.
- ^ Page Module:Citation/CS1/styles.css has no content.Civitello, Linda (2017). Baking powder wars: the cutthroat food fight that revolutionized cooking. Urbana, Illinois: University of Illinois Press. pp. 18–22. ISBN 978-0-252-04108-2.
- ^ Page Module:Citation/CS1/styles.css has no content.Zakiah, K.; Maulana, M. R.; Widowati, L. R.; Mutakin, J. (2021). "Applications of guano and K2CO3 on soil potential-P, potential-K on Andisols". IOP Conference Series: Earth and Environmental Science. 648 012185. doi:10.1088/1755-1315/648/1/012185.
- ^ Page Module:Citation/CS1/styles.css has no content."Office of Dietary Supplements - Potassium". Archived from the original on 2022-08-11. Retrieved 2024-12-18.
- ^ Page Module:Citation/CS1/styles.css has no content."Potassium Carbonate: What is it and where is it used?". Archived from the original on 2024-07-17. Retrieved 2024-12-18.
- ^ Leonard, J.; Lygo, B.; Procter, G. "Advanced Practical Organic Chemistry" 1998, Stanley Thomas Publishers Ltd
- ^ Page Module:Citation/CS1/styles.css has no content.Dunk, Anja (2021). Advent. London: Quadrille. pp. 13, 24, 26. ISBN 978 1 78713 726 4.
- ^ Page Module:Citation/CS1/styles.css has no content.Lydia M. Child (1832). The American Frugal Housewife.
Bibliography
- A Dictionary of Science, Oxford University Press, New York, 2004
- Page Module:Citation/CS1/styles.css has no content.Yu. Platonov, Andrew; Evdokimov, Andrey; Kurzin, Alexander; D. Maiyorova, Helen (29 June 2002). "Solubility of Potassium Carbonate and Potassium Hydrocarbonate in Methanol". Journal of Chemical & Engineering Data. 47 (5): 1175–1176. doi:10.1021/je020012v.
External links
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