Abstract
The 9 bottle problem is a classical lab job in high school and college chemistry.In solving this chemical “crossword” puzzle, students will be forced to integrate the knowledge acquired on a great variety of items such as solubility and colors of common inorganic precipitates, the possible evolution of gases, acid-base properties of salts, formation of metal-ion complexes, acid-base reactions, and oxidation-reduction reactions, including the influence of pH on them.A free copy of the program and the teacher guide, in Spanish, are available from the authors upon request.
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