What is the concentration of SO42– ions in the solution?
A chemist makes a solution of K2SO4 by dissolving 21.8 g K2SO4 in water to make 100.0 mL of solution. What is the concentration of SO42– ions in the solution? Assume that K2SO4 is the only solute in the solution. The molar mass of K2SO4 is 174.27 g/mol.
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21.8 K2SO4 x (1 mol K2SO4 / 174.27 g K2SO4) / 0.100L = 1.25 mol K2SO4 / 1 L.... 1.25 M K2SO4
Since the there is 1 mole of sulfate ions per mole of K2SO4, and it dissociates completely, then the SO4^2- ion concentration will also be 1.25M