Equilibrium Activity (20 points): Any two students submitting the same concentration values will be assigned a grade of 0 for this assignment. Hand write your work on this sheet or a blank sheet of notebook paper (number and label each item below), and upload a pdf file of a picture of your work Use the balanced, exothermic reaction: SiO2(aq) + 4HF(aq) = SiF4(aq) + 2H2O(g) at 25C to answer the questions below. 1. (2 pt) Assign different initial concentration values to each substance in the equation above (e.g. not all 0.10 M). Use 2 significant figures for each concentration value SiO2: 0.22 M HE: 0.10 M SiF4: 0.39 M HO: 0.74 M 2. (4 pts) Show the set-up for Q for this equation. Calculate Q using your concentration values above [S1F] [H2012 Qct [s102) CHF34 3. (4 pts) At equilibrium, the following concentrations were measured: (SiO2] = 0.121 M, and [HF] = 0.15 M. [SiF4] = 0.208 M, and [H20] = 0.17 M. Calculate K for this reaction. [S17] [120] Kc = -98.13203 [SLO2]CHF]4 (0.120)(0.15)4 =98 (0.208)(0.17) 4. (5 pts) In which direction does the reaction need to shift to reaction equilibrium? Clearly explain why, this requires more than simply stating relative values. Explain WHY it needs to shift in the direction indicated. 5. (5 pts) List 5 stresses that could be made to shift the equilibrium in the direction you stated above. Be specific about the stress (whether the concentration of a specific substance, temperature, etc. needs to increase or decrease). No more than two changes can refer to concentrations. 1)