Please answer the following questions to the best of your ability. You are evaluated on your logic and experimental understanding. Please be clear and concise with your answers. 1. For the same reaction, if you start with only reactants versus reactants and products, will Keg be the same? 2. Le Chatelier's principle allows scientists to predict shifts in equilibrium. If you increase the temperature on an exothermic reaction, which direction does equilibrium shift? Towards the reactants or towards the products? 3. The UV/Vis allows you to determine the concentration of a colored compound. In the equilibrium experiment, you did a multi-step calculation in order to calculate K for a mixture. Calculate the value of K using the following values (NOTE: you may need to look at the procedure to figure out how to convert from abs to concentration AND pay attention to how concentration changes with total volume). Vol of 0.002 Vol of 0.002 M KSCN M Fe(NO3)3 Vol water Abs after mixing 5.00 mL 2.71 mL 2.29 mL 0.553 Hint: The steps you should follow are 1) Convert abs to conc of FeNCS, 2) determine the equilibrium concentration changes with total volume). Vol of 0.002 Vol of 0.002 M KSCN M Fe(NO3)3 Vol water Abs after mixing 5.00 mL 2.71 mL 2.29 mL 0.553 Hint: The steps you should follow are 1) Convert abs to conc of FeNCS, 2) determine the equilibrium concentrations of KSCN and Fe(NO3)3, 3) calculate K. Step 2 is multiple calculations. 4. You are trying to determine K for the reaction between copper sulfate (CuSO4) and ammonium hydroxide (NH4OH) using a UV/Vis. Copper sulfate is a light blue solution; ammonium hydroxide (ammonia) is colorless. Both solutions are clear. When mixed they form a copper- ammonia-water complex that is clear and dark blue. You decide to use Le Chatelier's to shift the equilibrium by adding barium chloride (BaCl2). The solution is cloudy and a lighter blue, but not as light as the original solution. The measured absorbance goes up. 1. Which way would the equilibrium shift? HINT: Consider Ksp and the bystander ions. 2. Why does the absorbance go up? Does this suggest a forward or reverse shift