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Inclusion of the van't Hoff factor modifies the boiling point elevation formula to:
AΔT_b = i K_b m
BΔT_b = K_b m / i
CΔT_b = K_b m
DΔT_b = i² K_b m
Answer & Solution
Correct answer: A. ΔT_b = i K_b m
For electrolytes/associating solutes, **all four colligative formulas pick up an i factor**: ΔT_b = i K_b m, ΔT_f = i K_f m, Π = i C R T, (p⁰−p)/p⁰ = i × x_solute.
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