SOLVED:The Gibbs-Donnan effect is a phenomenon that occurs because of differing concentrations of ions across a semipermeable membrane, like a cell wall. Charge balance is maintained by other ions, like proteins. The differing concentrations set up a concentration cell whose voltage is ϕ=-(R T)/(ℱ) ln(cisw chigh)/(chigh) where claw and chigh are the lower and higher concentrations of ions, respectively. What is ϕif the concentrations of K^* in the cell is 139 mM(mM= millimolar) and outside of