Construct a pe-pH diagram for chromium considering only the dissolved species Cr3+, HCrO4, and CrO42, and solid chromium(III) hydroxide, Cr(OH)3 (s). Use only constants found in the Brezonik and Arnold tables of acidity constants, redox constants, and solubility constants. Ignore hydroxide complexes and other dissolved complexes, and ignore activity corrections. Base your diagram on a total chromium concentration of 104 M. (Use this concentration whenever a value must be chosen for a chromium-containing species.) For all plots, use this scale: pH (horizontal axis) from 4.0 to 8.0 ; pe (vertical axis) from 5 to 15. a. Show the development of your equations for the lines that will appear on the pe-pH plot. List the final equations that will be plotted (generally with pe as a function of pH or constant pH ), specifying for each equation what two species are being compared. Include equations for the redox stability limits of water, assuming unit partial pressures foH2(g)r and O2(g). b. Produce a plot with all lines from part (a) shown, including the water stability limits if they appear within the scale of your plot. c. Produce a second plot that is a finished pe-pH diagram, with each zone labeled with the appropriate species and with extraneous lines removed