Question

Match the following forms of borax with the number of water molecule(s) present as water of crystallisation.

• A. 10
• B. 5
• C. 0.0

Answer 1

Formulae for various forms of borax are as following:
Prismatic borax - $N{a}_2{B}_4{O}_7.10H_{2}O$
Octahedral borax - $N{a}_2{B}_4{O}_7.5H_{2}O$
Borax glass - $N{a}_2{B}_4{O}_7$
From the formulae given above, we can observe the number of water molecules present as water of crystallization for each of the forms of borax.