Hydrolysis of borax by diagrams

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Solution

Borax is a colorless, crystalline solid sparingly soluble in cold water but dissolves readily in hot water. It forms two important hydrates: octahedral borax Na₂B₄O₇.5H₂O and monoclinic borax Na₂B₄O₇.10H₂O.

Borax is slightly hydrolyzed in solution. As boric acid is a weak acid, the solution is alkaline in nature.
a buffer is a mixture of weak acid and its conjugate base
for example CH3COOH + CH3COONa is a buffer in which Ch3COOH is a weak acid and CH3COONa is a conjugate base(formed by the action of weakacidCH3COOH +strong base naOH)

same way B2O7^2- is the ion from the base Na2B4O7 accepts H+(proton) from H2O to form weak acid H3BO3(Boric acid)

a weak acid is produced by a strong base.
thus a mixture of B2O7^2- and H3BO3 acts as a buffer by thepresenceof a weak acid H3BO3 and its base B2O7^2-

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