146. Solving a chemistry problem

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3. Calculate the ξ-potential of colloidal particles of trisulphuric arsenic in water, if the electrophoresis for 260 s has shifted the boundary by 7.2 · 10 -2 m;
the gradient of the external electric field Η = 6.3 × 10 3 B / m; viscosity of the medium η = 10 -3 Pa · s; ε = 81; ε 0 = 8.85⋅10 -12 F / m.

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