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    Calculation of chlorine ions necessary for charge balance

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    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 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 ...

    Solution Summary

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