10. Using the Gouy-Chapman theory for a weakly charged surface, estimate the value of the potential ϕ and the volume charge density ρ at a distance x = 15 nm from the surface. The environment is an aqueous solution of NaCl with a concentration of 5 * 10-4 mol / l, temperature 293 K, relative permittivity of the medium 80.1, surface potential ϕ = ϕ0 = 0.02 V. Determine how many times ϕ and ρ will change if x increase three times.

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