See the attached file.
A chemical analysis of a surface water yields the following data:
Ion Concentration mg/L
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 ...
Cl- concentration in surface water analysis has been questioned. The solution finds the correct concentration of chlorine ions necessary for charge balance.