Trimagnesium phosphate

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Structural formula
Structural formula of trimagnesium phosphate
General
Surname Trimagnesium phosphate
other names
  • Magnesium phosphate
  • Magnesium phosphate tribasic
  • Trimagnesium bis (orthophosphate)
  • E  343
Molecular formula Mg 3 (PO 4 ) 2
Brief description

white odorless solid

External identifiers / databases
CAS number 7757-87-1
EC number 231-824-0
ECHA InfoCard 100.028.931
PubChem 24439
Wikidata Q6731399
properties
Molar mass 262.85 g mol −1
Physical state

firmly

Melting point

1184 ° C

solubility

practically insoluble in water (0.0418–0.0489 g · l −1 at 20 ° 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 .

Trimagnesium phosphate is an inorganic chemical compound of magnesium from the group of phosphates .

Occurrence

Trimagnesium phosphate occurs naturally in the form of octahydrate as the mineral Bobierrite .

Extraction and presentation

Trimagnesium phosphate can be obtained by reacting magnesium chloride or magnesium sulfate with sodium phosphate .

The octahydrate can be synthesized from mixed solutions of disodium hydrogen phosphate and magnesium sulfate at an initial pH of 6.4-7.0.

properties

Trimagnesium phosphate is a white odorless solid that is practically insoluble in water. As an anhydrate, it has a monoclinic crystal structure with the space group P 2 1 / m (space group no. 11) (a = 7.605, b = 8.233, c = 5.080 Å). The compound also occurs as 8- and 22-hydrate. Template: room group / 11

X-ray examinations show the coexistence of two types of lattice in the crystal in the octahydrate. One phase is monoclinic with the space group P21 / m or P21, the other phase is monoclinic with the space group C2 / m, C2 or Cm.

use

Trimagnesium phosphate is used as a fertilizer and is used in medicine for gastric acidosis.

Individual evidence

  1. ↑ Entry on E 343: Magnesium phosphates in the European database for food additives, accessed on June 28, 2020.
  2. ↑ a b c d e f g Entry on trimagnesium phosphate in the GESTIS substance database of the IFA , accessed on November 21, 2019(JavaScript required) .
  3. ↑ a b Baykal, A., Kizilyalli, M., & Kniep, R. (1997). Synthesis and Characterization of Anhydrous Magnesium Phosphate Mg 3 (PO 4 ) 2 . Turkish Journal of Chemistry, 21, 394-400.
  4. ↑ George A. Burdock: Encyclopedia of Food and Color Additives . CRC Press, 1997, ISBN 978-0-8493-9412-6 , pp. 1631 ( limited preview in Google Book search).
  5. ↑ a b Takafumi Kanazawa, Takao Umegaki, Masao Shimizu: The Synthesis of Mg (PO) -8H2O and Its New Polymorphism. In: Bulletin of the Chemical Society of Japan. 52, 1979, p. 3713, doi : 10.1246 / bcsj.52.3713 .
  6. ↑ Hans Annersten, Anders G. Nord u. a .: A High Pressure Phase of Magnesium Orthophosphate .. In: Acta Chemica Scandinavica. 34a, 1980, p. 389, doi : 10.3891 / acta.chem.scand.34a-0389 .
  7. ↑ Aramendía, María. Angeles; Borau, Victoriano; Jiménez, César; Marinas, José María .; Romero, Francisco José, Synthesis and Characterization of Magnesium Phosphates and Their Catalytic Properties in the Conversion of 2-Hexanol, Journal of Colloid and Interface Science, vol. 217, issue 2, pp. 288-298, September 1999, doi : 10.1006 / jcis.1999.6380
  8. ↑ Lexikon der Chemie: Magnesiumphosphate - Lexikon der Chemie , accessed on November 21, 2019