Boric acid or orthoboric acid (H3BO3)
It is obtained from borax by treating with dilute HCl or dillute H2SO4 ,
It can be obtained from the mineral colemanite as well by passing SO2 through a mixture of powdered mineral in boiling water,
Properties : (a) It is a very weak monobasic acid, do not act as the proton doner but behaves as a Lewis acid that is it accepts a pair of electrons from OH- ion of H2O ,
It acts as a strong acid in presence of polyhydroxy compounds like mannitol glycerol, etc. and can be titrated against strong alkali .
(b) With the NaOH it forms, sodium metaborate,
(c) With and conc. , it gives triethyl borate
(d) Action of heat : The complete action of heat on boric acid may be written as,
Structure : In boric acid, planar BO3-3 units are joined by hydrogen bonds to give a layer structure.
Uses : (a) As a food preservative. (b) As a mild antiseptic for eye wash under the name boric lotion. (c) For the preparation of glazes and enamels in pottery.
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