Orthoboric acid is formed when the aqueous solution is acidified with borax. Orthoboric acid is crystalline and soapy to touch. It is soluble in hot water.
Na2B4O7 + 2HCl + 5H2O → 2NaCl + 4B(OH)3
Boric acid is a weak monobasic acid. It acts a lewis acid by taking electrons from the hydroxyl group.
B(OH)3 + 2H2O → [B[OH]4]- + H3O+
Heating orthoboric acid at 370K gives metaboric acid and on further heating give Boric acid
H3BO3 → HBO2 → B2O3
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