(a) Draw a logarithmic concentration diagram for a 10-2M solution of hydrogen sulfide. Assume a closed system. (b) From the diagram, determine the pH for solutions that contain the following (1) 10-2 M H2S, (2) 10-2 M Na S, (3) 0.5 X 10m2 MHS and 0.5 X 10-2 M$2-, and (4) 0.5 x 10-2 M H2S and 0.5 x 10-2 M HS