Solved: The seven most abundant ions in seawater make up

Chapter 2, Problem 2.139

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The seven most abundant ions in seawater make up more than 99% by mass of the dissolved compounds. They are listed in units of mg ion/kg seawater: chloride 18,980; sodium 10,560; sulfate 2650; magnesium 1270; calcium 400; potassium 380; hydrogen carbonate 140. (a) What is the mass % of each ion in seawater? (b) What percent of the total mass of ions is sodium ion? 82.43 g NaCl 17.57 g Na Case 3: 50.00 g Na 50.00 g Cl2 100.00 g NaCl 9.34 g Cl2 Case 2: 39.34 g Na 70.00 g Cl2 Case 1: 39.34 g Na 60.66 g Cl2 100.00 g NaCl D E F A B C G H I siL48593_ch02_40-88.qxd 03/09/2009 8:37 pm Page 86 pinnacle 203:1961T_r2:1961T_r2:work%0:indd%0:siL5ch02: Apago PDF Enhancer (c) How does the total mass % of alkaline earth metal ions compare with the total mass % of alkali metal ions? (d) Which makes up the larger mass fraction of dissolved components, anions or cations?

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