Pentapotassium triphosphate

Structural formula
General
Surname	Pentapotassium triphosphate
other names	Potassium tripolyphosphate; E 451 ; KTPP;
Molecular formula	K 5 P 3 O 10
Brief description	white, hygroscopic solid
External identifiers / databases
ECHA InfoCard	100.034.145
PubChem	61695
Wikidata	Q15632716
properties
Molar mass	448.40 g mol −1
Physical state	firmly
solubility	very good in water (2000 g l −1 at 20 ° C)
safety instructions
GHS labeling of hazardous substances	no GHS pictograms
	no GHS pictograms
H and P phrases	H: no H-phrases
	P: ?
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Pentapotassium triphosphate is an inorganic chemical compound of potassium from the group of phosphates .

Extraction and presentation

Pentapotassium triphosphate can be obtained by reacting dipotassium hydrogen phosphate with potassium dihydrogen phosphate .

{\ displaystyle \ mathrm {2 \ K_ {2} HPO_ {4} + KH_ {2} PO_ {4} \ longrightarrow K_ {5} P_ {3} O_ {10} +2 \ H_ {2} O}}

properties

Pentapotassium triphosphate is a white, odorless solid that is readily soluble in water. The salt free of water of crystallization is strongly hygroscopic . The pH of a 1% aqueous solution is 9.9. In addition to the anhydrate, there is a di- and a tetrahydrate. The compound decomposes at 915 K.

use

Pentapotassium triphosphate, like pentasodium triphosphate, is used as a food additive with the number E451.

Individual evidence

↑ Entry on E 451: Triphosphates in the European database for food additives, accessed on June 28, 2020.
↑ ^a ^b ^c ^d Pentapotassium triphosphate. (PDF; 129 kB) FAO , accessed on December 4, 2017 (English).
↑ ^a ^b Ullmann's Encyclopedia of Technical Chemistry . Wiley, 1979, 1979, ISBN 3-527-20018-5 , pp. 332 ( limited preview in Google Book search).
↑ Template: CL Inventory / not harmonized There is not yet a harmonized classification for this substance . A labeling of pentapotassium triphosphate in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), retrieved on December 4, 2017, is reproduced from a self-classification by the distributor .
^ Arthur DF Toy: The Chemistry of Phosphorus Pergamon Texts in Inorganic Chemistry . Elsevier, 2016, ISBN 978-1-4831-3959-3 , pp. 518 ( limited preview in Google Book search).
^ DEC Corbridge: Phosphorus 2000: chemistry, biochemistry & technology . Elsevier, 2000, pp. 208 ( limited preview in Google Book search).
^ A. Durif: Crystal Chemistry of Condensed Phosphates . Springer Science & Business Media, 2013, ISBN 978-1-4757-9894-4 , pp. 81 ( limited preview in Google Book search).

[E-Nummer451-1] Entry on E 451: Triphosphates in the European database for food additives, accessed on June 28, 2020.

[FAO-2] Pentapotassium triphosphate. (PDF; 129 kB) FAO , accessed on December 4, 2017 (English).

[Ullmann-3] Ullmann's Encyclopedia of Technical Chemistry . Wiley, 1979, 1979, ISBN 3-527-20018-5 , pp. 332 ( limited preview in Google Book search).

[CLInventory-4] Template: CL Inventory / not harmonized There is not yet a harmonized classification for this substance . A labeling of pentapotassium triphosphate in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), retrieved on December 4, 2017, is reproduced from a self-classification by the distributor .

[Arthur_D._F._Toy-5] Arthur DF Toy: The Chemistry of Phosphorus Pergamon Texts in Inorganic Chemistry . Elsevier, 2016, ISBN 978-1-4831-3959-3 , pp. 518 ( limited preview in Google Book search).

[D._E._C._Corbridge-6] DEC Corbridge: Phosphorus 2000: chemistry, biochemistry & technology . Elsevier, 2000, pp. 208 ( limited preview in Google Book search).

[A._Durif-7] A. Durif: Crystal Chemistry of Condensed Phosphates . Springer Science & Business Media, 2013, ISBN 978-1-4757-9894-4 , pp. 81 ( limited preview in Google Book search).