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Calculation of chlorine ions necessary for charge balance

See the attached file.
Data:
A chemical analysis of a surface water yields the following data:
Ion Concentration mg/L
Ca^(2+) 90
Mg^(2+) 30
Na^+ 72
K^+ 6
Cl^- 120
SO4^(2-) 225
HCO3^- 165
pH 7.5

Problem: The Cl^- concentration in the water analysis given has been questioned. What concentration of Cl^- (mg/L) would make the cations and anions balance?

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To calculate charge balance, first you need to convert the concentrations to meq/L .
meq/L is also equal to millimoles of charge per liter (mM+/L or mM-/L depending on valence).
To do this, you need to know the molecular weight and charge of each ion, and whether it is positive ...

Solution Summary

Cl- concentration in surface water analysis has been questioned. The solution finds the correct concentration of chlorine ions necessary for charge balance.

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