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The effect of NaCl conc. on the activity of yeast cells watch

    • Thread Starter

    I did the experiment for this assessed practical today...

    As the title suggests, you use different concentrations of NaCl as well as a solution with 0% NaCl (i.e. distilled water). Anyway, I know that the higher concentrations should inhibit yeast activity due to its osmotic effect, but I was wondering whether yeast ought to be more active in water alone compared to a weak salt solution - because I found it to be more active in a weak salt solution compared to plain water, but logically that doesn't make sense? Were my results just wrong?

    Could it be because in pure water there is an osmotic imbalance the other way - i.e. water is taken up by the yeast cells. Maybe in a weak sodium chloride concentration the balance is perfect?
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