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Question 4.4: calculating the concentration of Ions in a Solution What is ...

calculating the concentration of Ions in a Solution

What is the total molar concentration of ions in a 0.350 M solution of the strong electrolyte Na_{2}SO_{4} , assuming complete dissociation?

IDENTIFY

Known Unknown
Molar concentration of compound
(0.350  M  Na_{2}SO_{4})		 Total molar concentration
of ions

STRATEGY
The ions come from the dissociation of Na_{2}SO_{4} , and therefore a reaction for dissolving Na_{2}SO_{4}  in water is written. The balanced reaction shows that 3  mol of ions are formed from 1 mol of the compound: 2 mol of Na^{+} and 1 mol of SO^{2-}_{4}.

Na_{2}SO_{4}(s)\overset{H_{2}O}{\longrightarrow }2 Na^{+}(aq) + SO^{2-}_{4}(aq)

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