To calculate the exchange current density i0 for the Zinc electrode, we can use the Butler-Volmer equation:i0 = n * F * A * k0 * C_red ^* C_ox ^1- where:n = number of electrons transferred in the half-reaction for Zn, n = 2 F = Faraday's constant 96485 C/mol A = electrode surface area we will assume it to be 1 cm for simplicity k0 = standard rate constant we will assume it to be 10^-7 cm/s for simplicity C_red = concentration of reduced species 0.1 M for Zn ions C_ox = concentration of oxidized species 1 M for Zn metal, as it is in its pure form = transfer coefficient 0.5 Now, we can plug in the values and calculate i0:i0 = 2 * 96485 * 1 * 10^-7 * 0.1 ^0.5 * 1 ^1-0.5 i0 = 192970 * 10^-7 * 0.3162i0 = 6.097 * 10^-5 A/cmSo, the exchange current density for the Zinc electrode immersed in a solution containing 0.1 M Zinc ions at 25 degrees Celsius is approximately 6.097 * 10^-5 A/cm.