. In this experiment, you want to test whether the concentration of electrolyte solution affects

  

. In this experiment, you want to test whether the concentration of electrolyte solution affects the cell potential of the galvanic cell. In order to do this, you must change one variable (independent) and see how it affects the other variable (dependent). Once you have decided on your independent and dependent variables, write your testable question . Propose a reasonable hypothesis for the experiment. Your hypothesis should explain how the change in your independent variable will affect your dependent variable. Provide any relevant theory to back up your prediction. Create a materials list needed to build your galvanic cell. Devise a procedure that could be performed to obtain the given results (below). This includes the steps required to build the cell and to measure the cell potential at different electrolyte concentrations. STEP 3: ANALYZING THE EXPERIMENT Choose ONE galvanic cell to analyze the results of. ((((((((((((((( THE Experimental Results WILL BE DOWN IN THE PDF)))))))))))))))))))))))))))) Analyze the data from to your chosen galvanic cell by completing the following questions/steps: From the data, what is the standard cell potential of your galvanic cell? How do you know? Calculate the ratio of product to reactant electrolyte concentrations for each measurement. This is called the reaction quotient . Put these values into a chart similar to Table 1 below, ordering your quotient values from least to greatest. Note: Table 1 shows the start of the table for the Zinc/Copper cell. If you have chosen a different cell to analyze, be sure to adjust your chart accordingly using the appropriate data set. In the second column of your chart, take the log of each Q value. In the final column, insert the appropriate cell potential. Create a graph with log Q on the x-axis and the cell potential (E°cell) on the y-axis. What type of relationship is this? Use your table to help you locate the point on your graph at which the ratio of reactant to product concentration (Q) is equal to 1. What is the cell potential at this point? What is the relevance of this point? Where on the graph is Q<1? Where is Q>1? What does this mean in relation to electrolyte concentrations? What does the graph tell you about how the cell potential of a galvanic cell changes as the cell operates? (Hint: Remember, galvanic cells are spontaneous reactions, which indicates the direction in which the reaction proceeds.) STEP 4: COMMUNICATING YOUR RESULTS Once you have analyzed the results, communicate your experimental plan and findings in a lab report.