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Magnetized Water: Science or Fraud?L. Lahuerta Zamora, G. M. Antón-Fos, P. A. Alemán López, and R. V. Martin Algarra Commercial water magnetizers provide a unique opportunity to help university and secondary students develop appropriate skepticism against extraordinary claims and use testing as the basis for their scientific evaluation. Lahuerta Zamora, L.; Antón-Fos, G. M.; Alemán López, P. A.; Martin Algarra, R. V. J. Chem. Educ.2008, 85, 1416.
Aqueous Solution Chemistry |
Magnetic Properties |
pH |
Titration / Volumetric Analysis |
Water / Water Chemistry
Phenolphthalein—Pink Tornado DemonstrationBruce R. Prall This demonstration uses the vortex generated by a spinning magnetic stir bar to demonstrate Le Châtelier's principle as it applies to the phenolphthalein equilibrium in water and provides an excellent opportunity to discuss limiting and excess reagents. Prall, Bruce R. J. Chem. Educ.2008, 85, 527.
Acids / Bases |
Equilibrium |
Kinetics |
pH
Chemical Speciation and Calculation of pH of a Sport DrinkJosé L. Guiñón Segura A recently published laboratory procedure allows students to see that the pointer function has a minimum value at the solution pH. However, the resolution of the pointer function requires the plotting the logarithmic concentration diagram, which is time-consuming and tedious. Segura, José L Guiñón. J. Chem. Educ.2008, 85, 371.
