Tetraboric acid

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Tetraboric acid
Names
IUPAC name
  • 3,7-Dihydroxy-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane
  • Pyroboric acid
Identifiers
3D model (
JSmol
)
ChemSpider
  • InChI=1S/B4H2O7/c5-1-9-3(7)11-4(8)10-2-6/h7-8H checkY
    Key: RTANKYMJXZNJGQ-UHFFFAOYSA-N checkY
  • OB(OB=O)OB(O)OB=O
Properties
B4H2O7
Molar mass 157.25 g·mol−1
Appearance white solid
Melting point 236 °C (457 °F; 509 K)[1]
Conjugate base
 Tetraborate
Hazards
GHS labelling:
Warning
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Tetraboric acid or pyroboric acid is a chemical compound with empirical formula H2B4O7.[2] It is a colourless water-soluble solid formed by the dehydration or polymerization boric acid.

Tetraboric acid is formally the parent acid of the

anion
[B4O7]2−.

Preparation

Tetraboric acid can be obtained by heating orthoboric acid B(OH)3 above about 170 °C:[3][4]

4 B(OH)3 → H2B4O7 + 5 H2O

References

  1. doi:10.1007/s41779-021-00700-3
  2. ISBN 0-7506-3365-4
    .
  3. doi:10.1007/s11144-021-02084-8
  4. doi:10.1007/s10973-017-6740-3


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