Calculate the freezing point depression (Tf) (in °C) for a 0.309 m NaBr solution

Question

Calculate the freezing point depression (Tf) (in °C) for a 0.309 m NaBr solution (with H2O as the solvent). Water is 1.86 Celsius/m
Enter your answer to two decimal places.
*she doesn’t give us initial temperature, so I’m not sure how to go about this. Unless I don’t need that. Calculate the freezing point depression (Tf) (in °C) for a 0.309 m NaBr solution (with H2O as the solvent). Water is 1.86 Celsius/m
Enter your answer to two decimal places.
*she doesn’t give us initial temperature, so I’m not sure how to go about this. Unless I don’t need that. Calculate the freezing point depression (Tf) (in °C) for a 0.309 m NaBr solution (with H2O as the solvent). Water is 1.86 Celsius/m
Enter your answer to two decimal places.
*she doesn’t give us initial temperature, so I’m not sure how to go about this. Unless I don’t need that.

Explanation / Answer

Tf    = i*m*Kf

NaBr(aq) ---------------> Na^+ (aq) + Br^- (aq)

   i = 2

m = 0.309m

Kf = 1.860C/m

Tf    = i*m*Kf

          = 2*0.309*1.86

         = 1.150

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