Question

What happens when Borax (Na B 0,10H,O) is treated with Conc. H.SO Give Chemi- Cal reaction (See Lesson-19)​

Answer 1

Boric acid is produced when sulphuric acid is reacted with borax.

• On adding a calculated quantity of concentrated sulphuric acid to a hot concentrated solution of borax, boric acid is produced.
• On heating borax with ethyl alcohol and concentrated sulphuric acid, vapours of triethyl borates are produced.
• When ignited these vapours burn with a green edged flame.
• The reaction is given below:

$Na_{2}B_{4}O_{7}+H_{2}SO_{4}+5H_{2}O$ → $4H_{3}BO_{3}+Na_{2}SO_{4}$