How many grams of MgCO3 dissolved per litre gives 290.66 mg/L hardness?
Question
How many grams of MgCO3 dissolved per litre gives 290.66 mg/L hardness?
Solution
The hardness of water is typically measured in terms of CaCO3, not MgCO3. However, if we assume that the hardness is due to MgCO3, we can calculate the amount of MgCO3 that would give a hardness of 290.66 mg/L.
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First, we need to know the molar mass of MgCO3. The molar mass of MgCO3 is approximately 84.31 g/mol.
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Hardness is usually expressed in terms of mg/L of CaCO3. The molar mass of CaCO3 is approximately 100.09 g/mol.
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To convert the hardness from CaCO3 to MgCO3, we can use the ratio of the molar masses. This gives us a conversion factor of 84.31/100.09 = 0.842.
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Multiply the given hardness by the conversion factor to find the equivalent hardness in terms of MgCO3. This gives us 290.66 mg/L * 0.842 = 244.7 mg/L.
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Therefore, 244.7 mg of MgCO3 per litre of water would give a hardness of 290.66 mg/L.
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