1.

Explain the extraction of boric acid from (i) Borax (ii) Colemanite

Answer»

Solution :(i) Borax: Borax is treated with hydrochloric acid or sulphric acid or NITRIC acid to give BORIC acid.
`underset(("Borax"))(Na_(2)B_(4)O_(7)).10H_(2)O+2HNO_(3)tounderset(("Boric acid"))(4H_(3)BO_(3))+2NaNO_(3)+5H_(2)O`
(ii) COLEMANITE: Colemanite is boiling with water to give boric acid.
`underset(("Colemanite"))(Ca_(2)B_(6)O_(11))+11H_(2)Ooverset(O)(to)2Ca(OH)_(2)+underset(("Boric acid"))(6H_(3)BO_(3))`


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