Click on the title of a resource to view it. To save screen space, only the first 3 resources are shown. You can display more resources by scrolling down and clicking on “View all xx results”.
For the textbook, chapter, and section you specified we found
Electrolysis of several aqueous solutions is carried out using a 9-V battery and pencil leads as electrodes. Because only the electrodes are shown in the videos, it is important to show these still images
or describe how the reactions were performed if students are to make sense of the videos. In each case the anode is on the left and a 9-V battery has been connected to the lead of each of the pencils near the eraser end with an alligator clip.
Reactions : WillSolnConduct (5 Variations) One gram of each of the following compounds is mixed with 100mL of water. Which will form solutions that will conduct electricity?
The Role of Water Chemistry in Marine Aquarium Design: A Model System for a General Chemistry ClassJeffrey J. Keaffaber, Ramiro Palma, and Kathryn R. Williams Water chemistry is central to aquarium design, and it provides many potential applications for discussion in undergraduate chemistry and engineering courses. This article uses a hypothetical tank to house ocean sunfish as a model to show students the calculations and other considerations that are needed when designing a marine aquarium. Keaffaber, Jeffrey J.; Palma, Ramiro; Williams, Kathryn R. J. Chem. Educ.2008, 85, 225.
Acids / Bases |
Aqueous Solution Chemistry |
Consumer Chemistry |
Oxidation / Reduction |
Stoichiometry |
Water / Water Chemistry
pH Paradoxes: Demonstrating That It Is Not True That pH ≡ -log[H+]Christopher G. McCarty and Ed Vitz Six demonstrations highlighting paradoxes that arise if pH is incorrectly defined as -log[H+] are presented as justification for the recommendation that pH should be correctly defined as pH = -log aH+ in textbooks. McCarty, Christopher G.; Vitz, Ed. J. Chem. Educ.2006, 83, 752.
Acids / Bases |
Aqueous Solution Chemistry |
Ion Selective Electrodes |
pH |
Quantitative Analysis
Linking Laboratory Experiences to the Real World: The Extraction of Octylphenoxyacetic Acid from WaterJorge E. Loyo-Rosales, Alba Torrents, Georgina C. Rosales-Rivera, and Clifford P. Rice A known quantity of the sodium salt of octylphenoxyacetic acid is dissolved in water, transformed to the acid (insoluble) form, and extracted using dichloromethane. These changes can be followed visually owing to conspicuous changes in solution turbidity. Loyo-Rosales, Jorge E.; Torrents, Alba; Rosales-Rivera, Georgina C.; Rice, Clifford P. J. Chem. Educ.2006, 83, 248.
Molecular Models of EDTA and Other Chelating AgentsWilliam F. Coleman Deirdre Bell-Oudry presents a variation on an old theme in her paper on using an indirect EDTA titration for sulfate analysis (1). EDTA and (often loosely) related species are this month's Featured Molecules.EDTA is a hexaprotic acid (H6Y2+) having the pKa values given in the featured paper (1). Figure 1 shows a distribution diagram for the EDTA system (2). At the pH of normal waters, the predominant species have one or both of the nitrogen atoms protonated.Complexation, however, requires that both nitrogens be deprotonated and it is generally assumed that the form that complexes with metal ions is Y4−. Structures of several forms of EDTA are included in the molecule collection (Figure 2). These structures are quite flexible having many conformations that are readily accessible at room temperature.An introduction to EDTA chemistry leads to broader questions of metal ion chelation or sequestration. Related chelating agents included in the molecule collection are EGTA, DCTA, NTA, BAPTA, and DTPA. Molecular dynamics and Hartree-Fock calculations on BAPTA (Figure 2) confirm that many conformations, ranging from those with the phenyl rings parallel to one another, to more elongated forms, are essentially isoenergetic in room temperature aqueous solution (3).Also included in the molecule collection are several crown ethers, an isophore (nonactin), and a cryptand. These not only provide students with a glimpse of the types of molecules being employed for metal ion sequestration but open a wide range of topics of current research in a variety of areas of inorganic, industrial, environmental, and biological chemistry.
Aqueous Solution Chemistry
Hydration of IonsEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Aqueous Solution Chemistry
Conjugate Acid-Base Pairs and pHEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
