Diffusion in Regard to Molecule Size: Will the Rate Fluctuate According to the size of NaCl, Glucose, and Starch?

Carly Suttle, Bailey Winters, Katie Thorne, Jeremy Kaplan


In our experiment the problem addressed was the differing rates of diffusion through a membrane.  Our hypothesis stated that smaller molecules such as NaCl diffused faster than larger molecules like starch.  The experiment we set up involved three different samples: NaCl, glucose, and starch.  We measured the rate of diffusion with a conductivity probe, glucose strips, and a spectrometer.  We found that the NaCl diffused at a higher rate than starch; however, glucose did not show a clear change.  Our hypothesis was partially supported.

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