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What is molal depression constant? Does it depend on nature of the solute ? |
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Answer» Solution :`K _(f) =` molar FREEZING point DEPRESSION constant or cryoscopic constnat. `Delta T _(f) = K_(f).m,` where `Delta T_(f)=` depression in freezing point, m = molality of the solution `K_(f)=` cryoscopic constant If `m =1, Delta T_(f) = K _(f)` i.e., cryoscopic constant is equal to the depression in freezing point for 1 molal solution cryoscopic constant depends on the molar concentration of the solute PARTICLES. `K_(f)` is directly proportional to the molar concentration of the solute particles. `Delta T_(f) = K _(f) xx (W_(B) xx 1000)/( M _(B) xx W_(A))` `W_(B)=` mass of the solute, `W_(A)=` mass of solvent, `M _(B)=` molecular mass of the solute. |
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