I built a cell with one side containing the solution 0.10 M CuSO4 with Cu(s) in it. The other side has 1 M NH3 and 0.05 M ZnSO4 with Zn(s) in it. The measured cell potential was 1.31. I am using the Nernst equation. I need to find the concentration of Zn^2+. E=E"-(0.059/2)logQ 1.31 = 1.10 -(0.059/2) log Q Q = 7.61E-8 I am confused about what Q is. I know its definition, but I am not sure about the reaction and which concentrations to use. Could someone help me out?