What is the total molar concentration of "ions" in A 0.150M solution of HClO4?
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With complete dissolution one would obtain 1 H^+1, and 1 ClO4^-1 for each molecule that dissociates. Since the solution is 0.150M, then 1 liter of the solution will contain 0.150 moles of each ion for a total of 0.300 moles of ions. The total molar concentration will be 0.300 M