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Calculation of chlorine ions necessary for charge balance

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See the attached file.
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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Solution Summary

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

Solution Preview

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 ...

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