Magnesium Concentration Formula:
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Definition: This calculator estimates the magnesium concentration in water based on total hardness and calcium concentration.
Purpose: It helps water treatment professionals and researchers determine magnesium levels when total hardness and calcium concentrations are known.
The calculator uses the formula:
Where:
Explanation: The formula calculates magnesium concentration by subtracting the calcium contribution from total hardness and dividing by the magnesium conversion factor.
Details: Proper magnesium estimation is important for water treatment, corrosion control, and understanding water chemistry.
Tips: Enter the total hardness in mg/L as CaCO₃ and calcium concentration in mg/L. Both values must be positive numbers.
Q1: Why are the coefficients 2.497 and 4.118 used?
A: These coefficients convert calcium and magnesium concentrations to equivalent CaCO₃ units based on their molecular weights.
Q2: What units should I use for input values?
A: Total hardness should be in mg/L as CaCO₃, and calcium concentration should be in mg/L.
Q3: Can this calculator be used for seawater?
A: This formula is primarily designed for freshwater systems. Seawater may require different calculations.
Q4: What if I get a negative result?
A: A negative result suggests either measurement errors or that calcium concentration exceeds what would be expected from the total hardness.
Q5: How accurate is this calculation?
A: The calculation provides a good estimate but may not account for other hardness-causing ions. Laboratory testing is recommended for precise measurements.