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  Inorganic Chemistry

Boric acid or orthoboric acid (H3BO3) :

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It is obtained from borax by treating with dil. HCl or dil.H2SO4 ,

Na2B4O7 + 2HCI + 5H2O ———→ 2NaCI + 4H3BO3

It can also be obtained from the mineral colemanite by passing SO2 through a mixture of powdered mineral in boiling water,

Ca2B6 O11 + 4SO2 + 11H2O ——→ 2Ca ( HSO3)2 + 6H3BO3

Properties : (a) It is a very weak monobasic acid, does not act as a proton doner but behaves as a Lewis acid i.e. it accepts a pair of electrons from OH- ion of H2O ,

H3BO3 + H2O ——→ [B (OH )4 ]- + H+

It acts as a strong acid in presence of polyhydroxy compounds such as glycerol, mannitol etc. and can be titrated against strong alkali .

(b) With NaOH it forms, sodium metaborate,

H3BO3 + NaOH ——→ NaBO2 + 2H2O

(c) With C2H5OH and conc. H2SO4 , it gives triethyl borate

Conc. H2SO4
H3BO3 + 3C2H5OH ————→ B ( OC2H5 )3 + 3 H2O

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