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It is prepared by colemanite by suspending it in boiling water and thn So₂ ( sulphur dioxide) is passed though it and then boric acid crystallizes & comes out from the solution..
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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. 
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