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Why an aqueous borax solution is alkalin...

Why an aqueous borax solution is alkaline to litmus?

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`B_4 O_(7)^(2-)` is conjugate base of weak acid tetraboric acid. Due to anion hydrolysis, the aqueous solution of borax is basic.
` B_(4)O_(7)^(2-) +7H_2 O hArr 2OH^(-) +4H_3 BO_(3)`.
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