What is the van 't Hoff factor (i) for an ideal dilute solution of calcium chloride, CaCl2, assuming complete dissociation into ions?
Answer and explanation
Correct answer: A. 3
Calcium chloride dissolves according to: CaCl2(s) -> Ca2+(aq) + 2 Cl-(aq). One formula unit dissociates into 1 Ca2+ ion and 2 Cl- ions, producing a total of 3 ions in solution. Hence, the ideal van 't Hoff factor is i = 3.
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