Answered: In this experiment, if you decreased…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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In this experiment, if you decreased the mass of the benzoic acid and kept the same amount of lauric acid, would it increase, decrease or have no effect on the freezing point of the solution (benzoic/lauric acid)? Explain using concepts and terns from this experiment.

Expert Solution

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The melting point of lauric acid and benzoic acid is 43.8^oC and 122^oC respectively it means at the freezing point of lauric acid, benzoic acid is present in solid state and acts as a non-volatile substance. In the given experiment, benzoic acid is present as the non-volatile solute and lauric acid is the solvent. The amount of non-volatile directly affects the freezing point of the solvent and the relation between the concentration of solute per kg of the solvent and freezing point depression, ΔT_f, is shown below.

$\begin{array}{rcl} ∆ T_{f} & = & k_{f} m \\ T_{f (p u r e s o l v e n t)} - T_{f (s o l u t i o n)} & = & i k_{f} \frac{m_{b e n z o i c a c i d}}{M M_{b e n z o i c a c i d} \times s o l v e n t i n k g} \end{array}$

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