Calcium Concentration Formula:
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Definition: This calculator determines the calcium concentration in water based on total hardness and magnesium concentration.
Purpose: It helps water treatment professionals and environmental engineers analyze water composition and hardness.
The calculator uses the formula:
Where:
Explanation: The formula subtracts the magnesium contribution from total hardness and converts the remainder to calcium concentration.
Details: Knowing calcium concentration helps in water softening, corrosion control, and determining water's scaling potential.
Tips: Enter the total hardness (as CaCO3) and magnesium concentration (mg/L). Both values must be positive numbers.
Q1: Why are the coefficients 4.118 and 2.497 used?
A: These coefficients convert magnesium to calcium carbonate equivalents and adjust for molecular weight differences.
Q2: What units should I use for input?
A: Total hardness should be in mg/L as CaCO3, and magnesium concentration in mg/L.
Q3: Can this calculator be used for seawater?
A: No, this formula is designed for freshwater systems. Seawater requires different calculations.
Q4: What if my calcium result is negative?
A: A negative result suggests either measurement errors or that magnesium dominates your water hardness.
Q5: How accurate is this calculation?
A: It provides a good estimate but for precise measurements, direct calcium testing is recommended.