Tetrasodium Pyrophosphate → HCID 86734064, compound

HRID 1287549Notes

Reaction equation

[Cl-].[Ca+2:2].[Cl-].[O-:4][P:5]([O:8][P:9]([O-:12])([O-:11])=[O:10])(=[O:7])[O-:6].[Na+:13].[Na+].[Na+].[Na+]>>[OH2:4].[OH2:4].[OH2:4].[OH2:4].[O-:6][P:5]([O:8][P:9]([OH:12])([O-:11])=[O:10])(=[O:4])[O-:7].[Na+:13].[Ca+2:2]

Participants

Reactant 2

HCID 24403Tetrasodium Pyrophosphate

HCID 5284359Calcium Chloride

Product 1

HCID 86734064HCID 86734064, compound

Procedure

A 25 weight percent aqueous solution of calcium chloride is added to a 15 weight percent aqueous solution of tetrasodium pyrophosphate in a suitable vessel until the pH reaches 7. The acicular crystals of calcium sodium pyrophosphate tetrahydrate are formed. The crystals are filtered, washed thoroughly, and dried at 60° C. The calcium sodium pyrophosphate tetrahydrate is then heated at a temperature within the range of 175° to 200° C for a period of 60 minutes until 3.2 moles of water of hydration is removed. The dehydrated solids were then ground. The structure of the material is now amorphous as determined by X-ray diffraction.

Sources & evidence

ORD record: ord-ad8ad2459f9846f5978bd2088315e930
Source dataset: uspto-grants-1976_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US03985675

Reaction notes

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