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

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