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.
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B4H2O7 | |
Molar mass | 157.25 g·mol−1 |
Appearance | white solid |
Melting point | 236 °C (457 °F; 509 K)[1] |
Conjugate base | Tetraborate |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Tetraboric acid is formally the parent acid of the tetraborate anion [B4O7]2−.
Tetraboric acid can be obtained by heating orthoboric acid B(OH)3 above about 170 °C:[3][4]