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On commercial scale, boric acid is prepared from a natural calcium borate called colemanite (Ca2B6O11.5H2O) by suspending it in boiling water while, sulphur dioxide is passed through it. Boric acid crystallizes out from the solution while, the other product CaSO3 remains in the solution.

Ca2B6O11.5H2 + 2SO2 + 4H2O 2Ca SO3 + 6H3BO3

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