A 0.518 g sample of limestone is dissolved in HCI and then the calcium is precipitated as CaC2O4. After filtering and washing the precipitate, it requires 40.0 mL of 0.250 N KMnO4 solution acidified with H2SO4 to titrate it as. The percentage of CaO in the sample is:MnO4−+H++C2O42−⟶Mn2++CO2+2H2O 

A 0.518 g sample of limestone is dissolved in HCI and then the calcium is precipitated as CaC2O4. After filtering and washing the precipitate, it requires 40.0 mL of 0.250 N KMnO4 solution acidified with H2SO4 to titrate it as. The percentage of CaO in the sample is:

MnO4+H++C2O42Mn2++CO2+2H2O

 

  1. A

    54.0%

  2. B

    27.1%

  3. C

    42%

  4. D

    84%

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    Solution:

     M eq. of KMnO4=M eq. of C2O42=M eq. of CaCO340×.25=M eq. of CaO10×1032= Mole of CaO%CaO=5×103×56×100.518=54%

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