If you intend to measure all the anions and cations in an unknown, one sanity check on your results is that the total positive charge should equal the total negative charge. The table lists concentrations of anions and cations measured in pond water in an undergraduate experiment and expressed in mg/mL. Find the total concentration of negative and positive charge (mol/L) to assess the quality of the analysis. What do you conclude about this analysis?

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Anion µg/mL Cation ug/mL + Na NH F 0.26 2.8 CI 43.6 0.2 NO3 so? 5.5 3.5 Mg2+ Ca2+ 12.6 7.3 24.0 Data from K. Sinniah and K. Piers, “lon Chromatography: Analysis of Ions in Pond Water," J. Chem. Ed. 2001, 78, 358.