715. Suppose the dispersion medium of the suspension is an aqueous solution of magnesium sulfate MgSO4 0.01 mol/dm3 at 25 °C (εg = 78.6). Calculate the DEL thickness ϰ-1 in this medium and decide which equation should be used to determine the ζ-potential from the electrophoresis results if the particle radius were 40 nm.
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