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Grade upto college level Inorganic Chemistry

How is boron obtained from borax? Give chemical equations with reaction conditions. Write the structure of B2H6­ and its reaction with HCI.

Profile image of Amit Saxena
12 Years agoGrade upto college level
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1 Answer

Profile image of Navjyot Kalra
12 Years ago
NOTE : When hot concentrated HCI is added to borax (Na2B4O7. 10H2O) the sparingly soluble H3BO3 is formed which on subsequent heating gives B2O3 which is reduced Na2B4O7 (anhydrous) + 2HCI(hot, conc.)
→ 2NaCI + H2B4O7
H2B4O7 + 5H2O → 4H3BO3 ↓
2H3BO3 \overset{strong heating}{\rightarrow}B2O3 + 3H2O
B2O3 + 6K → 2B + 3K2O or
B2O3 + 6Na → 2B + 3NaO or
B2O3 + 3Mg → 2B + 3MgO
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B2H­6 + HCI → B2H5CI + H2
[NOTE : Noramlly this reaction takes place in the presence of Lewis acid (AICI3)]

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