4. The sol was obtained as a result of an exchange reaction by pouring 10 ml of a 0.008 M MgSO4 electrolyte solution and 7 ml of a 0.008 M Pb(NO3)2 electrolyte solution.
Calculate the value of the ξ-potential for a given sol if its electrophoresis occurs at an external electric field strength of 200 V/m. The movement of particles in 10 minutes was 11 mm in a medium with a viscosity of 10-3 N*s/m2. To which electrode does the sol particle move?

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