1.

Explain physical and chemical properties of borax.

Answer»

Solution :Borax: It is the most important compound of boron.
Formula : `Na_2B_4O_7 . 10H_2O`
In FACT it contains the tetra nuclear units of `[B_4O_5(OH)_3]^(2-)`
CORRECT formula : `Na_2[B_4O_5(OH)_4] . 8H_2O`
Borax dissolves in water to GIVE an alkaline solution.
`Na_2B_4O_7 + 7H_2O to 2NaOH + UNDERSET"Orthoboric acid"(4H_3BO_3)`


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