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简答题计算题:试求取0.3000g的石灰石样品中CaCO3的百分含量,及CaO的百分含量。已知这一石灰石样品先经过25.00ml浓度为C(HCL)=0.2500mol/L的HCL溶液溶解,并经煮沸除去CO2后,再用C(NaOH)=0.200mol/L的NaOH溶液回滴,耗用NaOH溶液5.84ml。
  • 解:m(CaCO3)/1/2×100.1=0.2500×25.00×10-3-0.2000×5.84×10-3
    则m(CaCO3)=0.2544g
    CaCO3(%)=0.2544/0.300×100%=84.80%
    CaO(%)=84.80%×56.08/100.1=47.51%
    样品中含CaCO3为84.80%,含CaO为47.51%
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