268. Calculate the ζ-potential of iron hydroxide sol particles using the following experimental data:
- external emf is 200 V,
- distance between electrodes is 0.22 m;
- sol boundary shifts by 0.02 m in 15 min,
- permittivity = 81*(1/9*109)F/m,
- viscosity is 0.001 N*s/m2.
Consider the particle shape to be spherical.
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