p-BLOCK ELEMENTS GROUP 13(BORON FAMILY)
Structure, properties and uses of borax, boric acid, diborane, boron trifluoride, aluminium chloride and alums
Boron compounds :
Borax (Na2B4O7 . 10H2O)
Na2[B4O5(OH)4].8H2O
Preparation :
Boric Acid (H3BO3) :
BCl_{3} + H_{2} \rightarrow B_{2}H_{6}
BCl3 on silent electric discharge gives diborane
BF3 on reduction with lithium hydride gives diborane
BF3 on NaH gives diborane.
NaBH_{4} + I_{2} \xrightarrow[]{Diborane} B_{2}H_{6} + NaI + H_{2}
Chemical properties :
Inorganic benzene (B3N3H6) :
Similar to benzene
Obeys Huckel's rule
It is aromatic
12σ , 3π
B_{3}N_{3}H_{6} \xrightarrow[]{\Delta}(BN)_{x}
Boron nitride (or) Borazone
Inorganic graphite
Structure similar to graphite
Ca_{2}B_{6}O_{11} + SO_{2} + H_{2}O \rightarrow H_{3}BO_{3}
On heating H3BO3 at 100°C it gives meta boric acid (HBO3) on strong heating B2O3 (Boron oxide) at 435 Kelvin H2B4O7 on further heating B2O3 (Boron oxide)
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