Potassium hydrogen carbonate
Structural formula | ||||||||||||||||||||||
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General | ||||||||||||||||||||||
Surname | Potassium hydrogen carbonate | |||||||||||||||||||||
other names | ||||||||||||||||||||||
Molecular formula | KHCO 3 | |||||||||||||||||||||
Brief description |
odorless and colorless crystalline powder |
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Drug information | ||||||||||||||||||||||
ATC code | ||||||||||||||||||||||
properties | ||||||||||||||||||||||
Molar mass | 100.12 g mol −1 | |||||||||||||||||||||
Physical state |
firmly |
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density |
2.17 g cm −3 |
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Melting point |
Decomposes at approx. 200 ° C |
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solubility |
Easily soluble in water: 333 g l −1 (at 20 ° C) |
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safety instructions | ||||||||||||||||||||||
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Thermodynamic properties | ||||||||||||||||||||||
ΔH f 0 |
−963.2 kJ / mol |
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As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Potassium hydrogen carbonate is a salt of carbonic acid . It decomposes very quickly from a temperature of approx. 50 ° C, splitting off water and carbon dioxide . This creates potassium carbonate . From a physiological point of view, it is considered harmless; it is also contained in foods as a food additive E501.
use
Potassium hydrogen carbonate is used as a release agent and acid regulator in food. It is also used as an artificial raising agent in baking powder . When baking, it drives the cake dough by breaking it down into potassium carbonate through heat according to the following equation by splitting off water and carbon dioxide .
Potassium hydrogen carbonate is used as a plant protection agent ( fungicide ) in conventional and organic plant cultivation .
Manufacturing
Potassium hydrogen carbonate is formed when carbon dioxide is introduced into a solution of potassium carbonate in water :
Individual evidence
- ↑ Entry on E 501: Potassium carbonate in the European database on food additives, accessed on July 1, 2020.
- ↑ Entry on POTASSIUM BICARBONATE in the CosIng database of the EU Commission, accessed on July 1, 2020.
- ↑ a b c d e Entry on potassium hydrogen carbonate in the GESTIS substance database of the IFA , accessed on December 19, 2019 (JavaScript required)
- ↑ Hans-Dieter Jakubke, Ruth Karcher (Ed.): Lexicon of Chemistry , Spectrum Academic Publishing House, Heidelberg, 2001.
- ↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Standard Thermodynamic Properties of Chemical Substances, pp. 5-19.
- ↑ Armicarb