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Salt of Weak Acid and Strong Base

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Question

what happens to the ph of water when borax is dissolved in it??

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Solution

In aqueous solution on hydrolysis of borax produces NaOH and H₃BO₃.

Na₂B₄O₇ + 7H₂O → 4H₃BO₃ + 2NaOH

H₃BO₃ is a weak acid but NaOH is strong base. Thus in aqueous solution of borax, basic property will predominate. Hence in aqueous solution pH of the solution will be more than 7.

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Salt of Weak Acid and Strong Base

Standard XII Chemistry

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