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When aqueous solution of borax is acidified with hydrochloric acid, a white crystalline solid is formed which is soapy to touch. Is this solid acidic or basic in nature ? Explain.

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When an aqueous solution of borax is acidified with HCl boric acid is formed
`Na_(2)B_(4)O_(7)+2HCl+5H_(2)Orarr2NaCl+underset("Boric acid")(4H_(3)BO_(3))`
Boric acid is a white crystalline solid. It is soapy to touch because of its planar layered structure. Boric acid is a weak monobasic acid. It is not a protonic acid but acts as a Lewis acid by accepting electrons from a hydroxyl ion

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