What is the theoretical van 't Hoff factor () for an aqueous solution of potassium ferrocyanide, , assuming complete electrolytic dissociation?
Answer and explanation
Correct answer: B.
- Step 1: Potassium ferrocyanide dissociates in water according to: .
- Step 2: One formula unit generates four potassium cations and one complex anion, yielding a total of ions.
- Step 3: For complete dissociation, .
Answer
.
Why not the others: counts only the potassium ions; mistakenly breaks cyanide ligands from iron; and breaks the complex into individual atoms.
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