67. Solving a chemistry problem

4. Determine the ζ-potential of iron hydroxide hydrosol particles according to the following data: during electrophoresis, the shift of the color boundary α over a time of 60 min is 0.01 m, the distance between the electrodes is 0.50 m, the voltage applied to the electrodes is 120 V. The dielectric constant of the medium is 81 ; viscosity 1*10-3 Pa*s. Electrical constant ε0=8.85*10-12F/m.