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Answer to Question #57789 in General Chemistry for tracy guido

Question #57789
Three aqueous solutions are made, FeCl2, NaCl, Na2S all of which have the same molarity. Which two solutions will have the same freezing point depression? Hint: Tb = i x kb)
a. FeCl2 and Na2S FeCl2 = Fe+2 and 2 Cl- = 1+2 = 3 Na2S = 2Na+ and S-2 = 2+1 = 3
b. FeCl2 and NaCl FeCl2 = Fe+2 and 2 Cl- = 1+2 = 3 NaCl = Na+ and Cl- = 1+1 = 2
c. Na2S and NaCl Na2S = 2Na+ and S-2 = 2+1 = 3 NaCl = Na+ and Cl- = 1+1 = 2
I believe it would be a because the i is same for both
Expert's answer
Your assumption is 100% correct!
FeCl2 and Na2S solutions contain the same concentration of ions. Therefore temperature depression will be equal.

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