Calculate the value of the zeta-potential (ζ-potential) for polystyrene latex, if during electrophoresis the displacement of the boundary between the sol and the side liquid during time t amounted to a. The voltage applied to the electrodes is equal to E = 110 V, the distance between the electrodes is l = 0.6 m (see Table 8). The dielectric constant of water is 81, the dielectric constant ε0 = 8.85*10-12 F/m, the viscosity of the medium η = 1.0*10-3 Pa*s. To calculate the zeta potential, time must be converted to seconds.

Option 4
t, min 45
a*102,m 3.75

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