Although there are many ions in seawater, the overall charges of the dissolved cations and anions must maintain charge neutrality. Consider only the six most abundant ions in seawater, as listed in Table 18.5 (Cl−, Na+, SO4 2−, Mg2+, Ca2+, and K+), calculate the total charge in Coulombs of the cations in 1.0 L of seawater. Calculate the total charge in Coulombs of the anions in 1.0 L of seawater. To how many significant figures are the two numbers equal?

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