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A list of key readings about PH.
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  • William L. Masterton and Cecile N. Hurley (2008). Chemistry: Principles and Reactions, 6th Edition. Brooks/Cole, pp. 355 - 359. ISBN 0-495-12671-3. 
Demonstrates that a droplet of mineral oil containing 2-hexyldecanoic acid can successfully navigate a maze if a pH gradient is established by soaking a small block of high gel strength agarose in HCl and putting it at the end opposite to that in which the droplet is released.
See also the supplementary videos at the journal's site.