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16 January, 08:11

Calculate the mass (in grams) 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).

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  1. 16 January, 09:42
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    The units of ppm means parts per million. Also, It is equivalent to milligrams per liter. It is one way of expressing concentration of a substance. It u sually used to describe the concentration of something in water or soil. We calculate the mass of CaCO3 as follows:

    Mass = 75 mg/L (.050 L) = 3.75 mg CaCO3
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