MEASUREMENT OF THE STANDARD ELECTRODE POTENTIAL FOR THE SILVER, SILVER CHLORIDE ELECTRODE

LABORATORY REPORT 1. Introduction – no more than one page. This section should contain all the necessary background information that enables non-experts in the topic understand the experiment with ease and also appreciate the significance of the work and how equation 3 and 4 come and what is mean ideal condition and none-ideal condition . 2. Experimental – approximately half a page. Be warned that you are not to include unnecessary details in this section. 3. Results and Discussion (you are to present results in the Results section, followed by a discussion and/or comments on the results in the Discussion section). (a) Test for the validity of Equation (3) by plotting EMF + 0.1183 log10 C against C. You may need to adjust the scale of your ordinate (by double-clicking on the axis and then change the scale) in order to enlarge the plot appropriately. Does the plot appear linear? If so, then perform (i) the Wald-Wolfowitz runs test, (ii) the statistical significance test of the correlation coefficient, and (iii) ANOVA. Based on all these results, comment on the validity of Equation (3)? How would you deduce the value of Eo from this particular plot? (THINK carefully!) Ag|AgCl (b) Next, test for the validity of Equation (4) by plotting EMF + 0.1183 log10 C – 0.0602 C against C making sure that the scale of the ! ordinate axis is appropriately expanded. What is the correlation coefficient of this plot? Comment on the associated residual plot based on the Wald-Wolfowitz runs test. Also, test for the significance of the correlation coefficient. Perform ANOVA to investigate the linearity of the plot. Based on these comments and the EMF + 0.1183 log C – 0.0602 C against C plot, give an estimate of Eo 10 Ag|AgCl and the parameter b (and its units). Also, estimate the 95% confidence intervals for both the slope and the intercept. (c) How do the values for the EMF of the galvanic cell shown in Figure 1 compare to the literature value? (d) List all possible sources of errors encountered in this section of the experiment. Do not only include experimental errors arising from common glassware used! You need to consider possible errors arising from the chemistry involved. 4. Conclusion. then answer additional exercise