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yangkl930: ½ð±Ò+5, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2014-05-21 11:12:25
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   Na2B4O7 + 7H2O = 2Na[B(OH)4] + 2B(OH)3
    Na[B(OH)4] = NaOH + B(OH)3
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