Water → HCID 131720318, compound

HRID 2293888Notes

Reaction equation

HRID 2293888 reaction equation
[B].[O:2]=[O:3].[OH2:4]>B(O)(O)O>[O:2]=[O+:3][O-:4].[OH2:2].[OH2:2].[OH2:2].[OH2:2].[OH2:2].[OH2:2].[OH2:2].[OH2:2]

Participants

4

Reactant 2

HCID 962Water2×HCID 131720319HCID 131720319, compound

Product 1

HCID 131720318HCID 131720318, compound

Reagents, catalysts & solvents 1

HCID 7628Boric AcidSolvent

Procedure

Kemp, The Chemistry of Borates, Part I, page 70 (1956), reported that an aqueous solution of boric acid kept at 40° C. for 3 weeks deposits a mixture of CaO·3B2O3 ·4H2O and 2CaO·3B2O3 ·9H2O. Kemp also reported that CaO·3B2O3 ·8H2O decomposes to form CaO·3B2O3 ·4H2O. According to Supplement to Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry, Volume V, Part A: Boron-Oxygen Compounds, pages 550-551 (1980), CaO·3B2O3 ·4H2O occurs as a solid phase in the systems Na2O--CaO--B2O3 --H2O and CaO--NaCl--B2O3 --H2O at 25° C. and pH 5.5-6.5. Hydrothermal treatment of meyerhofferite in boric acid solution at 85-250° C. produced crystals of both the tetrahydrate and pentahydrate together with ginerite (2CaO·7B2 O3·8H2O).

Workup

  1. customat 25° C.

Sources & evidence

ORD record
ord-14dc7cfade9d4801a4cf75097d84084b
Source dataset
uspto-grants-1997_11
Patent number
US05688481

Reaction notes

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