Question

What is the chemical formula of the borax bead??

Answer 1

The bead made of borax. The chemical formula of borax(Which is also called sodium tetraborate decahydrate),is as follows :
Na2B4O7.10H2O or
Na2[B4O5(OH)4].8H2O

Answer 2

Answer: It is a bead made up of boprax having formula  $Na_2B_4O_7.10H_2O$. This is known as sodium tetraborate decahydrate.

Explanation:

Borax bead is used to detect the metals in a given solution. It is used for inorganic qualitative analysis. The test which used borax bead for the analysis is known as borax bead test.

When powdered borax having formula $Na_2B_4O_7.10H_2O$, is heated strongly on the flame of the burner, it usually forms a colorless glassy bead which is known as borax bead and is made up of sodium meta borate having formula $NaBO_2$ and boric oxide having formula $B_2O_3$.