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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 of borax is acidified with hydrochloric acid, a white precipitate of boric acid is formed, it is soapy to touch and is of acidic nature.
`Na_(2)B_(4)O_(7)+2HCl+5H_(2)Orarr2NaCl+4B(OH)_(2)`

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