What concentration of aqueous FeCl₃ would have the same osmotic pressure as a 0.20 M solution of CaCl₂ at the same temperature, assuming ideal behavior? A)0.60 M B)0.40 M C)0.30 M D)0.15 M E)0.10 M

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Quizplus · Accepted Answer

The osmotic pressure depends on the number of particles in solution. CaCl2 dissociates into 3 ions (1 Ca2+ and 2 Cl-), so a 0.20 M solution has an effective concentration of 0.60 M in terms of particles. FeCl3 dissociates into 4 ions (1 Fe3+ and 3 Cl-), so to have the same osmotic pressure, the concentration of FeCl3 should be 0.15 M (0.15 M x 4 = 0.60 M).

What Concentration of Aqueous FeCl3 Would Have the Same Osmotic

What Concentration of Aqueous FeCl₃ Would Have the Same Osmotic