Calcium hydrogen phosphate
Structural formula | ||||||||||||||||
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General | ||||||||||||||||
Surname | Calcium hydrogen phosphate | |||||||||||||||
other names |
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Molecular formula | CaHPO 4 | |||||||||||||||
Brief description |
colorless and odorless solid |
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properties | ||||||||||||||||
Molar mass |
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Physical state |
firmly |
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density |
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Melting point |
approx. 370 ° C (decomposition) |
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solubility |
very bad in water (0.1 g l −1 at 25 ° C) |
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safety instructions | ||||||||||||||||
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As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Calcium hydrogen phosphate , also called dicalcium phosphate , is a calcium salt of orthophosphoric acid , belongs to the phosphates and has the composition CaHPO 4 .
Occurrence and representation
Calcium hydrogen phosphate occurs naturally in various modifications . Anhydrous calcium hydrogen phosphate occurs naturally as monetite , the dihydrate (CaHPO 4 · 2H 2 O) is known as brushite . The water of crystallization of the dihydrate is split off at 109.degree. Technically, calcium hydrogen phosphate is produced by reacting calcium hydroxide with phosphoric acid at high temperatures.
use
Calcium hydrogen phosphate is an acidity regulator and is used, for example, in the food industry for cherry cake fillings in cans. The shelf life of potato products is increased and they are lightened. The creaminess of processed cheese is increased. It is used as an emulsifier in the baking industry . When adding calcium hydrogen phosphate, the water content of ham and boiled sausage can be increased. Calcium hydrogen phosphate, together with calcium dihydrogen phosphate and calcium phosphate, is approved in the EU as a food additive under the common number E 341 ("calcium phosphate") for certain foods with different maximum quantity restrictions, also for organic foods . According to the Additive Admissions Ordinance , these are - largely uniform for most of the approved phosphates - individual specifications for a wide range of numerous different types of food. The maximum permitted amounts vary from 0.5 to 50 grams per kilogram (in creamer for vending machines) or the lack of a fixed limit ( quantum satis - as required, for food supplements and sometimes for chewing gum). A permissible daily dose of 70 milligrams per kilogram of body weight was set for the total amount of phosphoric acid and phosphates ingested.
In smaller quantities it is used for pest control against grain beetles and moths . In homeopathy it is also known as Calcium phosphoricum. The product is mainly used to treat indigestion, bone pain and toothache.
It is also used as a feed additive and is found in many fertilizers, calcium supplements, and toothpastes.
See also
- Calcium phosphate (E 341)
- Calcium dihydrogen phosphate (E 341a)
Individual evidence
- ↑ a b c d e f g Entry on calcium hydrogen phosphate in the GESTIS substance database of the IFA , accessed on December 22, 2019(JavaScript required) .
- ↑ Data sheet calcium hydrogen phosphate (PDF) from Merck , accessed on January 19, 2011.
Web links
- Practice for class. Homeopathy and Trad. Chin. Medicine: calcium hydrogen phosphate