Question

The formula of mineral borax is:

• A. $N{a}_2{B}_4{O}_7$
• B. $N{a}_2{B}_4{O}_7.4H_{2}O$
• C. $N{a}_2{B}_4{O}_7.5H_{2}O$
• D. $N{a}_2{B}_4{O}_7.10H_{2}O$

Answer 1

The correct option is D $N{a}_2{B}_4{O}_7.10H_{2}O$

The formulae for mineral borax is :

$N{a}_2{B}_4{O}_7\cdot 10H_{2}O$

Mineral Borax is also easily converted to boric acid and other borates, which have many applications.

When mineral borax is added to a flame, it produces a yellow green color. Borax is not used for this purpose in fireworks due to the overwhelming yellow colour of sodium. Boric acid is used to colour methanol flames a transparent green.