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I want your help in determining surfactant concentration in an aqueous solution. Surfactant is an anionic surfactant, namely Sodium Lauryl Sulfate (SLS). I have a pure SLS water solution whose concentration is unknown. Please help me through the problem.

Thanks in advance.

Isha Arora
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One suggestion: shine a beam of light through a transparent, plane-walled container of the solution at a known, acute angle of incidence; measure the angle at which the beam is propagating inside the fluid; work out the refractive index using Snell's law; then look up the concentration that produces that refractive index in, e.g., figure 1 of https://core.ac.uk/download/pdf/161435553.pdf. Looks like it should be possible to observe a difference in angle of several degrees between pure water and saturated solution, so measurable with an ordinary protractor.