Calcium hydrogen phosphate

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Structural formula
Calcium ion Hydrogen phosphate ion
General
Surname Calcium hydrogen phosphate
other names
  • Calcium dibasic phosphate
  • Dicalcium orthophosphate
  • Dicalcium monohydrogen phosphate
  • Calcium monohydrogen phosphate
  • Calcium hydrogen orthophosphate
  • secondary calcium phosphate
  • Calcium phosphoricum
Molecular formula CaHPO 4
Brief description

colorless and odorless solid

External identifiers / databases
CAS number
  • 7757-93-9
  • 7789-77-7 (dihydrate)
EC number 231-826-1
ECHA InfoCard 100.028.933
PubChem 24441
Wikidata Q414619
properties
Molar mass
  • 136.06 g mol −1 (anhydrous)
  • 172.09 g mol −1 (dihydrate)
Physical state

firmly

density
  • 2.89 g cm −3 (anhydrous)
  • 2.32 g cm −3 (dihydrate)
Melting point

approx. 370 ° C (decomposition)

solubility

very bad in water (0.1 g l −1 at 25 ° C)

safety instructions
GHS labeling of hazardous substances
no GHS pictograms
H and P phrases H: no H-phrases
P: no P-phrases
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

Individual evidence

  1. ↑ 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) .
  2. ↑ Data sheet calcium hydrogen phosphate (PDF) from Merck , accessed on January 19, 2011.

Web links