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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13-02-2017
Chemistry

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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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Аноним Аноним · Answer 1 · 2017-02-22T11:04:58+01:00

1 part per million is the same as

1 mcg/mL (mcg = 1 micro gram = 1 * 10^-6 grams).
125 ppm = 125 mcg/mL

125 mcg/ml * [1 gram / 1 * 10^6 mgrm] = 1.25 * 10^-4 grams

The density of hard water is 1.000 grams / mL

50 mL of water contains 1.25 * 10^-4 grams.

given mass = 1.25 * 10^-4
Molar mass = 100.0 grams / mole
n = ?????

n = 1.25 * 10^-4/100 = 1.25 * 10^-6 moles.

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