Question

#23) What is borax? Discuss the chemistry of borax bead test
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Answer 1

The chemical name of borax is sodium tetra boret . It's formula is Na2B4O7.4H2O .

Borax bead test.

When the heat given to borax then it sacrifice the krisrtal water and become transparent . More heat given to it then we get borax bead . NA2O3 is borax bead . It is used to test d-block elements. When it react with d block elements it gives different colours.

SORRY I AM IN HINDI MEDIUM SO MY ENGLISH IS WEAK.I CANT EXPLAIN IT IN BETTER WAY SORRY

Answer 2

$\huge\mathcal\blue{Answer:}$

$\boxed{\red{\texttt{Borax\:bead\:test}}}$

Sodium tetaraborate decahydrate $\boxed{\green{Na_2B_4O_7.10H_2O}}$is called borax

On heating borax first it swells up due to the elimination of the water molecules. On further heating it melts to a liquid which then solidifies to a transparent glassy mass. It contains sodium meta borate and boric acid

$\red{Na_2B_4O_710H_2O}{\rightarrow}\blue{Na_2B_4O_7}{\rightarrow}\pink{2NaBO_2+B_2O_3}$

${B_2O_3}$ combines with meat oxides to form metal metaborates which form coloured beads. This reaction is called " Borax bead test"

$\blue{B_2O_3+CoO}{\rightarrow}\pink{Co(BO_2)_2}$