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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.)
New Analytical Method for the Determination of Detergent Concentration in Water by Fabric DyeingSet Seng, Masakazu Kita, and Reiko Sugihara This article describes a high school classroom activity in which an acrylic fabric is used as the extraction medium in the analysis of detergent concentration rather than more harmful organic solvents. An handmade reflection photometer, assembled with inexpensive materials such as LED, PVC tube, and CdS sensor, is used to determine the detergent concentration. Seng, Set; Kita, Masakazu; Sugihara, Reiko. J. Chem. Educ.2007, 84, 1803.
Aqueous Solution Chemistry |
Consumer Chemistry |
Dyes / Pigments |
Laboratory Equipment / Apparatus |
Quantitative Analysis |
Solutions / Solvents |
Water / Water Chemistry
Popcorn—What's in the Bag?Marissa B. Sherman and Thomas A. Evans Three independent activities explore microwave popcorn, the nature of the packaging, and the popcorn produced. Sherman, Marissa B.; Evans, Thomas A. J. Chem. Educ.2006, 83, 416A.
Carbohydrates |
Nutrition |
Physical Properties |
Solutions / Solvents |
Water / Water Chemistry
The Effect of Ionic Strength on the Solubility of an ElectrolyteJoan D. Willey The theory of activity versus concentration is important in industrial, environmental, and biochemistry. The increase in solubility of an electrolyte in a solution of a second electrolyte with no common ions compared with pure water is not an easy concept to grasp because it seems to be counterintuitive. The simple experiment described here illustrates this principle visually and dramatically. Students attempt to dissolve CaSO42H2O (gypsum) in pure water and in 0.25 M NaCl. Willey, Joan D. J. Chem. Educ.2004, 81, 1644.
