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Physical & Chemical properties

Water solubility

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Administrative data

Endpoint:
water solubility
Type of information:
not specified
Adequacy of study:
supporting study
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
secondary literature

Data source

Referenceopen allclose all

Reference Type:
review article or handbook
Title:
Mellor's comprehensive treatise on inorganic and theoretical chemistry.
Author:
Mellor JM
Year:
1980
Bibliographic source:
Mellor's comprehensive treatise on inorganic and theoretical chemistry. Volume V, Part A: Boron-oxygen compounds: 254.
Reference Type:
publication
Title:
No information
Author:
Dawber JG & Matusin DH
Year:
1982
Bibliographic source:
J. Soc., Faraday Trans. 1, 78 : 2521 - 2528.

Materials and methods

Test material

Constituent 1
Chemical structure
Reference substance name:
Diboron trioxide
EC Number:
215-125-8
EC Name:
Diboron trioxide
Cas Number:
1303-86-2
Molecular formula:
B2O3
IUPAC Name:
bicyclo[1.1.1]diboroxane

Results and discussion

Water solubility
Water solubility:
22 g/L
Temp.:
20 °C
pH:
3.7

Any other information on results incl. tables

Concentration: 26.6 g/L at 20 °C. pKa = 9.15 at 20 °C. Boric oxide is the anhydride of boric acid. It is hydroscopic and takes up water to form boric acid. Therefore for practical purposes one part of boric oxide is equivalent to 1.776 parts of boric acid in aqueous solution.

pH of aqueous solution ranges from 6.1 at 0.056 % w/w boric oxide, equivalent to to 3.7 at 2.66 % w/w boric oxide equivalent at 20 °C.

Applicant's summary and conclusion

Conclusions:
The water solubility of the test substance was reported as 22 g/L at 20 °C, pH 3.7. Concentration: 26.6 g/L at 20 °C. pKa = 9.15 at 20 °C. Boric oxide is the anhydride of boric acid. It is hydroscopic and takes up water to form boric acid. Therefore for practical purposes one part of boric oxide is equivalent to 1.776 parts of boric acid in aqueous solution.
pH of aqueous solution ranges from 6.1 at 0.056 % w/w boric oxide, equivalent to 3.7 at 2.66 % w/w boric oxide equivalent at 20 °C.
Executive summary:

Puplished data on water solubility properties of the test item (Mellor, 1980 & Dawber, 1982) indicates the water solubility of the test substance 22 g/L at 20 °C, pH 3.7. Concentration: 26.6 g/L at 20 °C. pKa = 9.15 at 20 °C. Boric oxide is the anhydride of boric acid. It is hydroscopic and takes up water to form boric acid. Therefore for practical purposes one part of boric oxide is equivalent to 1.776 parts of boric acid in aqueous solution.

pH of aqueous solution ranges from 6.1 at 0.056 % w/w boric oxide, equivalent to 3.7 at 2.66 % w/w boric oxide equivalent at 20 °C.