Question: b) The data set below represents the surface pressure-area behaviour recorded for the cationic surfactant [CH3(CH2)nN(CH3)3]+adsorbed on an aqueous subphses at 25C. (i) Sketch the

b) The data set below represents the surface pressure-area behaviour recorded for the cationic surfactant [CH3(CH2)nN(CH3)3]+adsorbed on an aqueous subphses at 25C. (i) Sketch the -A curve and identify the behaviour of the monomolecular film. (ii) Identify clearly where collapse of the surface film occurs. Comment on this collapse. (iii) Estimate the molecular mass of the surfactant. (iv) Estimate the molecular area occupied by an individual surfactant entity [30 marks]

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