It looks like you are interested in the effects of pH and maybe salt based on your list of potential solutions? I like the idea of an acidic solution (vinegar or orange juice), a neutral solution (e.g. water), and a basic solution (baking soda?) for testing the effects of pH. I'd suggest that you test just a few so that you can replicate the treatments. If you have replication you can do statistics!
Do you have a way of measuring pH?
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This material is based upon work supported by the National Science Foundation under Grant No. 1502892.
Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.
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