Dimagnesium phosphate is a compound with formula MgHPO4. It is a Mg2+ salt of monohydrogen phosphate. The trihydrate is well known, occurring as the mineral newberyite.[1]
It can be formed by reaction of stoichiometric quantities of magnesium oxide with phosphoric acid.
- MgO + H3PO4 → MgHPO4 + H2O
If monomagnesium phosphate is dissolved in water, it forms phosphoric acid and deposits a solid precipitate of dimagnesium phosphate trihydrate:
- Mg(H2PO4)2 + 3 H2O → Mg(HPO4).3H2O + H3PO4
The compound is used as a nutritional supplement, especially for infants and athletes. Its E number is E343.[2]
See also
References
- ^ Klaus Schrödter; Gerhard Bettermann; Thomas Staffel; Friedrich Wahl; Thomas Klein; Thomas Hofmann (2008). “Phosphoric acid and phosphates”. Ullmann’s Encyclopedia of Industrial Chemistry. Ullmann’s Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a19_465.pub3. ISBN 978-3527306732. S2CID 94458523.
- ^ Relevant part of the German “Zusatzstoff-Zulassungsverordnung Archived 2012-05-18 at the Wayback Machine”, the official German implementation of the respective regulation of the European Union
