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简答题用硼砂(Na2B4O7?10H2O)标定盐酸溶液时,其反应式是:Na2B4O7+2HCl+5H2O=4H3BO3+2NaCl称取0.4767g纯硼砂标定某盐酸溶液,共用了25.00ml,该盐酸,计算此盐酸的浓度?(Na2B4O7?10H2O的摩尔质量为381.4g/mol)
  • 设盐酸的浓度为xmol/L
    Na2B4O7+2HCl+5H2O=4H3BO3+2NaCl
    0.4767/381.40.025x
    ∴x=(2×0.4767/381.4)/0.025=0.09999mol/L
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