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17 August, 22:45

A 1.2516 gram sample of a mixture of caco3 and na2so4 was analyzed by dissolving the sample and completely precipitating the ca as cac2o4. the cac2o4 was dissolved in sulfuric acid and the resulting h2c2o4 was titrated with a standard kmno4 solution. the titration required 35.62 milliliters of 0.1092 m kmno4. calculate the number the number of moles of h2c2o4 that reacted with the kmno4. calculate the number of moles of caco3 in the original sample. calculate the percentage by weight of caco3 in the original sample.

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  1. 17 August, 22:59
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    0.009725 moles of H2C2O4

    0.009725 moles CaCO3

    Mass percentage = 77.77%

    Explanation:

    Step 1: The balanced equation

    2MnO4 - + 5C2H2O4+6H + →2Mn2 + + 10CO2+8H2O

    We can see that for 2 moles of Mno4 - consumed, there is 5 moles of C2H2O4 needed and 6 moles H + to produce 2 moles Mn2+, 10 moles of CO2 and 8 moles of H2O

    Step 2: Calculate moles of MnO4-

    Molarity = Moles/volume

    Moles of Mno4 - = Molarity of MnO4 - * Volume of Mno4-

    Moles of Mno4 - = 0.1092M * 35.62 * 10^-3 L

    Moles of MnO4 - = 0.00389 moles

    Step 3: Calculate moles of H2C2O4

    Since there is needed 5 moles of C2H2O4 to consume 2 moles of MnO4-

    then for 0.00389 moles of MnO4-, there is 5/2 * 0.00389 = 0.009725 moles of H2C2O4

    Step 4: Calculate moles of CaCO3

    moles of H2C2O4 = moles CaCO3, therefore, 0.009725 moles H2C2O4 = 0.009725 moles CaCO3

    Step 5: Calculate mass of CaCO3

    Molar mass of CaCO3 = 100.09 g/mole

    Mass of CaCO3 = moles of CaCO3 * Molar mass of CaCO3

    Mass of CaCO3 = 0.009725 moles * 100.09 g/mole = 0.9734 g

    Step 6: Calculate percentage by weight of CaCO3

    Mass of CaCO3 = 0.9734g

    Mass of original sample = 1.2516g

    Mass percentage = 0.9734/1.2516 * 100% = 77.77%
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