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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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HCl acidifies the borax to give boric acid, which monobasic and weak. It needs to accept electrons in order to complete its octet and thus acts as a Lewis Acid.

Na_{2}B_{4}O_{7} + HCl + H_{2}O\rightarrow 2NaCl + 4H_{3}BO_{3}

B(OH)_{3} + H_{2}O\rightarrow [B(OH)_{4}]^{-} +H^{+}

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