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15 August, 00:45

Calculate the mass of calcium carbonate present in a 50.00 mL sample of an aqueous calcium carbonate standard, assuming the standard is known to have a hardness of 75.0 ppm (hardness due to CaCO3). Also given is the density of the sample (0.9977g/mL) and the molar mass of CaCO3 (100.0g/mol).

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  1. 15 August, 00:49
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    Given the volume and density of the sample, we can calculate its mass.

    mass = density * volume

    mass = 0.9977 * 50

    mass = 49.885 g

    75 ppm Calcium Carbonate means that when there is 75 parts of Calcium Carbonate every one million parts of standard. Let one part be one gram.

    So,

    75 * 10⁻⁶ g CaCO₃ every gram of standard

    grams of standard =.49.885

    mass of CaCO₃ = 3.74 * 10⁻³ grams
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