chemical reaction of extraction of boron from borax
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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 B2O3 + 3H2O
B2O3 + 6K → 2B + 3K2O or
B2O3 + 6Na → 2B + 3NaO or
B2O3 + 3Mg → 2B + 3MgO

B2H6 + HCI → B2H5CI + H2
→ 2NaCI + H2B4O7
H2B4O7 + 5H2O → 4H3BO3 ↓
2H3BO3 B2O3 + 3H2O
B2O3 + 6K → 2B + 3K2O or
B2O3 + 6Na → 2B + 3NaO or
B2O3 + 3Mg → 2B + 3MgO

B2H6 + HCI → B2H5CI + H2
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