What are the species that are formed when BCl3 is hydrolysed?

The trichlorides of group 13 being covalent in nature, form tetrahedral [M(OH)4],on hydrolysis in water.

When BCl3 is treated with water, it hydrolyses and forms [B[OH]4]–

BCl3 + 3H2O→ B(OH)3 + 3HCl

B(OH)3 + H2O→[B(OH)4]- + H+

The Boron in the [B[OH]4] ion involves one 2s orbital and 3 2p orbitals.

Thus, the hybridization of the Boron atom is sp3.

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