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Solutions : FreezePtDepression (20 Variations) It takes 6.86 kg of ethylene glycol (antifreeze) to decrease the freezing point of 6.50 kg of water to -25.0oF (-31.7oC). How much sodium chloride (NaCl) would it take to decrease the freezing point of 6.50 kg of water to -25.0oF? (Assuming all the salt will dissolve in that amount of water.)
The Fuge Tube Diode Array SpectrophotometerB. T. Arneson, S. R. Long, K. K. Stewart, and J. J. Lagowski Presents details for adapting a diode array UVvis spectrophotometer to incorporate the use of polypropylene microcentrifuge tubesfuge tubesas cuvettes. The fuge tubes also can serve as reaction vessels, which permits the ready study of chemical systems involving heterogeneous phases by eliminating the need for tedious separations. Arneson, B. T.; Long, S. R.; Stewart, K. K.; Lagowski, J. J. J. Chem. Educ.2008, 85, 1663.
Laboratory Equipment / Apparatus |
Solutions / Solvents |
Spectroscopy |
UV-Vis Spectroscopy
Investigating the Stability of Benzoyl Peroxide in Over-the-Counter Acne MedicationsMarina Canepa Kittredge, Kevin W. Kittredge, Melissa S. Sokol, Arlyne M. Sarquis, and Laura M. Sennet Students use peroxide strips to investigate the stability of the benzoyl peroxide found in an over-the-counter acne medication when added to various solutions of water, ethanol, polyethylene glycol, and isopropyl myristate. Canepa Kittredge, Marina; Kittredge, Kevin W.; Sokol, Melissa S.; Sarquis, Arlyne M.; Sennet, Laura M. J. Chem. Educ.2008, 85, 1655.
Consumer Chemistry |
Drugs / Pharmaceuticals |
Nonmajor Courses |
Solutions / Solvents
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.
Principal Species and pHRobert M. Hanson Calculates concentrations of principal species in solutions using JavaScript. You can specify whether "1st-year" methods or mass-charge balance methods are used in the calculations. Solutions can be chosen from the included set or you can design your own.
Acids / Bases |
Titration / Volumetric Analysis |
pH |
Solutions / Solvents
TitrationsEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Titration / Volumetric Analysis
Determining Vitamin C in FoodsEd Vitz A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
