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Ion Concentration from Solution Concentration Ionic compounds dissociate in solution, multiplying the molarity by the number of ions present What is the Chloride Concentrations [Cl^{}] in the following solutions? 2.0M NaCl since NaCl dissolves according to this reaction NaCl => Na^{+} + Cl^{} the NaCl to Cl^{} ratio is 1:1, therefore [Cl^{}]= 1 x 2.0M =2.0M 1.5M AlCl_{3} since AlCl_{3} dissolves according to this reaction AlCl_{3} = > Al^{3+} + 3 Cl^{} the AlCl_{3} to Cl^{} ratio is 1:3, therefore [Cl^{}]= 3 x 1.5M= 4.5M _{ }2.0M CaCl_{2} since CaCl_{2} dissolves according to this reaction CaCl_{2} = > Ca^{2+} + 2 Cl^{} the CaCl_{2} to Cl^{} ratio is 1:2, therefore [Cl^{}]= 2 x 2.0M= 4.0M
