Additional Related Projects

• Try insoluble household powders instead of kaolin or silica gel and repeat this experiment (e.g., try talc, lime, powdered chalk, flour). Note your observations and propose an explanation for each result observed. (Hint: are these powders reacting with the fronts produced by the applied electric field, or are they inert towards them?)

• During the experiment on the movement of acidic and basic fronts, the rate of displacement of the red and blue spots can be measured (in cm/s) and plotted. Because protons have a higher transport number, one would expect their rate to be higher (after an initial induction period). (See Ibanez-Velasco, 2005).

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