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Improving Conceptions in Analytical Chemistry: ci Vi = cf VfMargarita Rodríguez-López and Arnaldo Carrasquillo Jr. A common misconception related to analytical chemistry, which may be generalized as the failure to recognize and to account analytically for changes in substance density, is discussed. A cautionary example is made through the use of mass-based units of composition during volumetric dilution. The correct application of the volumetric dilution equation ci Vi = cf Vf is discussed. A quantitative description of the systematic error introduced by incorrect use of the volumetric dilution equation is also specified. Rodríguez-López, Margarita; Carrasquillo, Arnaldo, Jr. J. Chem. Educ.2005, 82, 1327.
Industrial Chemistry |
Nomenclature / Units / Symbols |
Quantitative Analysis |
Solutions / Solvents
The Use of Extent of Reaction in Introductory CoursesSebastian G. Canagaratna This article discusses the use of the extent of reaction as an alternative to the traditional approach to stoichiometry in first-year chemistry. The method focuses attention on the reaction as a whole rather than on pairs of reagents as in the traditional approach. The balanced equation is used as the unit of change. Canagaratna, Sebastian G. J. Chem. Educ.2000, 77, 52.
Stoichiometry |
Thermodynamics |
Nomenclature / Units / Symbols
Temperature Scale Conversion as a Linear Equation: True Unit Conversion vs Zero-Offset CorrectionReuben Rudman The equation used for the interconversion between the Fahrenheit and Celsius temperature scales is in reality the general case of the straight-line equation (y = ax + b). This equation is the paradigm for many of the calculations taught in introductory chemistry. Rudman, Reuben. J. Chem. Educ.1998, 75, 1646.
