The formula is given by:
\[
\Delta T_f = i \cdot K_f \cdot m
\]
where:
- \(\Delta T_f\) is the change in freezing point,
- \(i\) is the van't Hoff factor,
- \(K_f\) is the freezing point depression constant,
- \(m\) is the molality of the solution.
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