Which ionic compound will lower the freezing point the most if 1 mol of its added to 1 L of water?

The ionic compound that will lower the freezing point the most when 1 mol is added to 1 L of water is one that dissociates into the maximum number of ions. Strong electrolytes like NaCl or CaCl2 would be more effective at lowering the freezing point of water compared to weak electrolytes like Na2SO4.