First slide

Orthoboric acid

Question

Which of the following will give orthoboric acid?

Moderate

A

Na₂B₄O₇ + HCl(conc.)
B

Na₂B₄O₇ + H₂SO₄(conc.)
C

BCl₃ + H₂O
D

All of these

Solution

${Na}_{2} B_{4} O_{7} + 2 HCl + 5 H_{2} O ⟶ 2 NaCl + 4 B (OH)_{2}$
${Na}_{2} B_{4} O_{7} + H_{2} {SO}_{4} + 5 H_{2} O \to {Na}_{2} {SO}_{4} + 4 H_{3} {BO}_{3}$
${BCl}_{3} + 3 H_{2} O \to H_{3} {BO}_{3} + 3 HCl$ .

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