How many grams of MgCO3 dissolved per litre gives 290.66 mg/L hardness? (A)A. 70.56 mg/L B. 48.23 mg/LC. 81.49 mg/L D. 66.12 mg/L

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How many grams of MgCO3 dissolved per litre gives 290.66 mg/L hardness? (A)A. 70.56 mg/L B. 48.23 mg/LC. 81.49 mg/L D. 66.12 mg/L
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Solution 1

The hardness of water is typically measured in terms of the concentration of calcium carbonate (CaCO3). However, in this case, we are dealing with magnesium carbonate (MgCO3).

The molar mass of MgCO3 is approximately 84.31 g/mol, while the molar mass of CaCO3 is approximately 100.09 g/mol.

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