See Section 3.2.1 (Properties) (Page 58)
Give equations to represent the following reactions.
(a) Borax is heated with Coo.
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Answer:
Borax (Na
2
B
4
O
7
.10H
2
O), on heating gets fused and loses water of crystallisation. It swells up into a fluffy white porous mass which then melts into a colourless liquid and forms a clear transparent glass bead consisting of boric anhydride and sodium metaborate.
Na
2
B
4
O
7
.10H
2
O
△
Na
2
B
4
O
7
△
2NaBO
2
+
Boric anhydride
B
2
O
3
Boric anhydride is non-volatile. When it is reacted with a coloured metallic salt, a characteristic coloured bead of metal metaborate is formed.
Thus, when reacted to cobalt oxide, forms blue coloured Co(BO
2
)
2
bead.
B
2
O
3
+CoO⟶
Cobalt metaborate (blue bead)
Co(BO
2
)
2
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