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Direct linkRavera, Mauro; Nucera, Alessandro; Gabano, Elisabetta – Journal of Chemical Education, 2022
This is an easy and inexpensive laboratory experiment in which undergraduate students at the Bachelor's degree level in Chemistry can measure formation constants of complexes [Ni(en)[subscript n](OH[subscript 2])[subscript 6-2n]][superscript 2]+ (n = 1, 2 or 3; en = ethylenediamine) through an acid-base titration. The background information…
Descriptors: Laboratory Experiments, Color, College Science, Science Instruction
Farinas, Pedro Sanchez; Doimo, Ana Luiza; da Silva, Marcos A. R.; Teixeira, Ivo F. – Journal of Chemical Education, 2020
Herein, we describe a simple laboratory experiment to address nanomaterial synthesis, plasmon resonance, and its application to detect Cu[superscript 2+] in ultralow concentrations. The proposed experiment is very visual and appealing for chemistry students, especially the undergraduate-level chemistry major. In this experiment, the aggregation of…
Descriptors: Chemistry, Science Instruction, Undergraduate Students, Laboratory Experiments
Sampaio, Cátia I.; Sousa, Luís F.; Dias, Alice M. – Journal of Chemical Education, 2020
Anthocyanins are natural pigments belonging to the flavonoid family that generate the red, blue, and purple colors of fruits, vegetables, and flowers. Their structure and color are dependent on various factors, like the pH. Anthocyanins appear red in acidic, purple in neutral, and blue in basic solutions, making them suitable for use as natural pH…
Descriptors: Color, Chemistry, Science Instruction, Laboratory Experiments
Ferraro, Giovanni; Fratini, Emiliano – Journal of Chemical Education, 2019
A procedure for one-pot preparation and characterization of silver 1D nanostructures is described. The main advantages of this synthetic approach are the simplicity and reproducibility, where the size of the final product can be controlled just by changing the reaction time. This experiment is designed as a laboratory introduction to colloidal…
Descriptors: Color, Science Instruction, Teaching Methods, Undergraduate Students
Warzecha, Evan; Berto, Timothy C.; Wilkinson, Chad C.; Berry, John F. – Journal of Chemical Education, 2019
A new undergraduate inorganic chemistry laboratory experiment is presented. An introduction of the spectrochemical series and ligand exchange is explored using the coordination complex dirhodium tetraacetate, Rh[subscript 2](OAc)[subscript 4]. Students have measured the absorption spectra of the Rh[subscript 2] complex in the presence of various…
Descriptors: Laboratory Experiments, Science Instruction, Molecular Structure, Chemistry
Kachapova, Farida; Kachapov, Ilias – International Journal of Mathematical Education in Science and Technology, 2010
This note introduces a monotony coefficient as a new measure of the monotone dependence in a two-dimensional sample. Some properties of this measure are derived. In particular, it is shown that the absolute value of the monotony coefficient for a two-dimensional sample is between /"r"/ and 1, where "r" is the Pearson's…
Descriptors: Undergraduate Students, Correlation, Color, College Mathematics
