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Δtf = kf × m this formula relates the drop in freezing point (δtf) to the molal freezing point depression constant (kf) and the molal concentration of the solute (m). under which conditions does this formula apply? when the mass of the solvent equals 1 kg when the solute is ionic, not molecular when the solute is molecular, not ionic when the solvent is water, not other liquids

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Answer is: when the solute is molecular, not ionic.
When the solute is ionic, formula contains the van 't Hoff factor: ΔTf = Kf · m · i.
Van 't Hoff (i) is the number of dissolved particles the solute produces and it is usually i = 2,3...
For molecular compounds (most non-electrolytes) van't Hoff factor is equal one.

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