Chemistry:Tetraboric acid
From HandWiki
| Names | |
|---|---|
| Other names
Tetraboric acid
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| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
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| Properties | |
| 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 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 | |
Tracking categories (test):
Tetraboric acid or pyroboric acid is a chemical compound with empirical formula H
2B
4O
7.[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 [B
4O
7]2−.
Preparation
Tetraboric acid can be obtained by heating orthoboric acid B(OH)
3 above about 170 °C:[3][4]
- 4 B(OH)
3 → H
2B
4O
7 + 5 H
2O
References
- ↑ 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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