First slide

Borax

Question

What is the nature of aqueous borax solution ?

Easy

A

Neutral
B

Acidic
C

Alkaline
D

Amphoteric

Solution

The aqueous solution of borax is alkaline in nature.
$\mathop {N{a_2}{B_4}{O_7}}\limits_{Borax} + 2{H_2}O \to \mathop {2NaOH}\limits_{Strong\,base} + \mathop {\mathop {4{H_2}{B_4}{O_7}}\limits_{Weak\,acid} }\limits_{Tetra\,boric\,acid}$
OR
$\mathop {N{a_2}{B_4}{O_7}}\limits_{Borax} \to 2N{a^ + } + {B_4}O_7^{ - 2}$
${B_4}O_7^{ - 2} + 2{H_2}O \to {H_2}{B_4}{O_7} + \mathop {2O{H^ - }}\limits_{Alkaline}$
Anion of weak acid only undergoes hydrolysis but cation of strong base cannot undergo hydrolysis.
→ During anionic hydrolysis ${O{H^ - }}$ ions released to the solution therefore the solution is basic or alkaline in nature.

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