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Which of the following salts will show the same van’t Hoff factor (i) as K4[Fe(CN)6] in solution?

1. Al2(SO4)3
2. NaCl
3. Al(NO3)3
4. Na2SO4

Correct answer: Al2(SO4)3

Solution

K4[Fe(CN)6] dissociates into 4 K+ and 1 [Fe(CN)6]4-, so van't Hoff factor i = 5. Al2(SO4)3 gives 2 Al3+ + 3 SO4^2- = 5 ions, so i = 5 as well. (NaCl i=2, Al(NO3)3 i=4, Na2SO4 i=3.) The match is Al2(SO4)3.

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