A voltaic cell with Mn/Mn2+ and Cd/Cd+ half-cells has the following initial concentrations: [Mn2+]=0.090 M; [Cd2+]=0.060 M. What is the initial Ecell? What is Ecell when [Cd2+] reaches 0.0050 M? What is [Mn2+] when Ecell reaches 0.055 V? What are the equilibrium concentrations of the ions?