In any solution, there must be a balance between the positive and negative charges of the ions that are present. Use the data in Table 20.2 to determine how close to a balance of charge is achieved for the ions in seawater. (The table lists only the major ions in seawater, and the balance between positive and negative charge will only be approximate.)

Data given in Table 20.2

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Concentrations of Some Cations and Anions TABLE 20.2 in Seawater Dissolved Concentrations Species (mmol/L) 550 460 52 10 10 Element Chlorine CI- Sodium Na+ Magnesium Mg²+ Calcium Ca²+ Potassium K+ Carbon HCO3, CO3²- Phosphorus HPO4²- 30 <1