Consider a colloid of charged spheres all of radius 0.1 m in an aqueous solution of sodium chloride. a) Calculate the Debye screening length for salt concentration of 10-5, 10-4, 10-3 and 10-2 mol/dm3 b) For each of the salt concentrations above, estimate the volume fraction for the transition to an ordered phase. You may assume that the particles may be considered to behave as hard spheres with an effective radius equal to sum of the physical radius and Debye screening length.