100. Solving a chemistry problem

4. At a potential gradient of 110 V/m, an air bubble moves during electrophoresis to the cathode at a speed of 4.1*10-6 m/s. Calculate the ζ-potential at the air-water interface, if the viscosity of water is ŋ=1.2*10-3 n*s/m2, the dielectric constant is 81.