11. (a) Calculate the emf of a concentration cell made up of copper electrodes in 0.1 M CuSO4 and 0.5 M CuSO4, neglecting the liquid-junction potential. (b) Write the spontaneous reaction of the cell and indicate which electrode is the anode. Ans. (a) 0.010 V; (b) 0.1 M CuSO4 electrode is anode.