Part 1: Determination of KHT Saturation Temperatures 1. Is the sign of ΔS∘ obtained (Question 3 b ) consistent with the
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Part 1: Determination of KHT Saturation Temperatures 1. Is the sign of ΔS∘ obtained (Question 3 b ) consistent with the
Part 1: Determination of KHT Saturation Temperatures 1. Is the sign of ΔS∘ obtained (Question 3 b ) consistent with the expectations of dissolving a salt in water? HINT: Write out the equation for KHT (s) dissolving in water (from the introduction). How does the formation of ions in solution affect entropy? 2. What is the significance of the sign of ΔG∘ at room temperature (298K)? 3. Calculate a temperature at which ΔG∘=0. What is the importance of this temperature? 4. What is the significance of the sign of ΔHrxn∘ ? 5. When the enthalpy of dissolution (ΔHrxn∘) is positive, should solubility increase or decrease as the temperature is increased? Explain. Part 2: Observation of the Common Ion Effect 1. Define the "Common Ion Effect." If outside sources are consulted (such as a textbook, etc.), be sure to cite where the information was obtained. 2. Based on this definition, why is the saturation temperature of the KHT/KCl mixture higher than that of KHT alone? Explain. 3. What are some potential errors associated with this experiment? How can these errors affect the results obtained, and how can these errors be prevented in the future?
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