Tetraboric acid

Tetraboric acid
Names
	Other names Tetraboric acid
Identifiers
CAS Number	12447-38-0;
3D model (JSmol)	Interactive image;
ChemSpider	450911 ;
	InChI InChI=1S/B4H2O7/c5-1-9-3(7)11-4(8)10-2-6/h7-8H Key: RTANKYMJXZNJGQ-UHFFFAOYSA-N ;
	SMILES OB(OB=O)OB(O)OB=O;
Properties
Chemical formula	B4H2O7
Molar mass	157.25 g·mol−1
Appearance	white solid
Density	g cm−3
Melting point	236[1] °C (457 °F; 509 K)
Conjugate base	Tetraborate
Hazards
	GHS labelling:
Signal word	Warning
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

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 of boric acid.

Tetraboric acid is formally the parent acid of the tetraborate 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

Abdullah Selim Parlakyigit and Celaletdin Ergun (2022): "Facile synthesis method for in situ composites of TiB₂/B₄C and ZrB₂/B₄C." Journal of the Australian Ceramic Society, volume 58, pages 411–420. doi:10.1007/s41779-021-00700-3
Greenwood, N. N.; & Earnshaw, A. (1997). Chemistry of the Elements (2nd Edn.), Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4.
Gurwinder Kaur, Shagun Kainth, Rohit Kumar, Piyush Sharma and O. P. Pandey (2021): "Reaction kinetics during non-isothermal solid-state synthesis of boron trioxide via boric acid dehydration." Reaction Kinetics, Mechanisms and Catalysis, volume 134, pages 347–359. doi:10.1007/s11144-021-02084-8
Siavash Aghili, Masoud Panjepour, and Mahmood Meratian (2018): "Kinetic analysis of formation of boron trioxide from thermal decomposition of boric acid under non-isothermal conditions." Journal of Thermal Analysis and Calorimetry, volume 131, pages 2443–2455. doi:10.1007/s10973-017-6740-3

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