The total hardness a water sample is 200 mg/l as CaCO3. The calcium (Ca2+) concentration is...

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The total hardness a water sample is 200 mg/l as CaCO3. The calcium (Ca2+) concentration is...

The total hardness a water sample is 200 mg/l as CaCO3. The calcium (Ca2+) concentration is 150 mg/l. Calculate the magnesium (Mg2+) concentration, in mg/l.

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Answer 1

Answer #1

Total Hardness is equal to the sum of the concentrations of Calcium and magnesium in mg/L.

Total Hardness =200 mg/L

concentration of calcium = 150 mg/ L

Let concentration of magneisum = x mg/L

Therefore, 200 mg/L = 150 mg/L + x mg/L

x = 200 - 150

x = 50 mg/L

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Answer 2

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