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CBSE Class 11-science Answered

Give an account of Borax bead test.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
answered-by-expert Expert Answer

Borax on heating first loses water molecules and forms sodium metaborate which on further heating turns into a transparent liquid, which solidifies into glass like material known as borax bead.

Na2B4O7.10H2ONa2B4O7  2NaBO2 + B2O3
                                                               Sodium      Boric
                                                             metaborate   anhydride
The metaborates of many transition metals have characteristic colours and, therefore, borax bead test can be used to identify them in the laboratory.
 
Answered by | 04 Jun, 2014, 03:23: PM
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