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Nyasulu, Frazier; Barlag, Rebecca; Wise, Lindy; McMills, Lauren – Journal of Chemical Education, 2013
The thermodynamic properties of weak acid ionization reactions are determined. The thermodynamic properties are corresponding values of the absolute temperature (T), the weak acid equilibrium constant (K[subscript a]), the enthalpy of ionization (delta[subscript i]H[degrees]), and the entropy of ionization (delta[subscript i]S[degrees]). The…
Descriptors: Chemistry, Science Instruction, Science Laboratories, College Science
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Barlag, Rebecca; Nyasulu, Frazier – Journal of Chemical Education, 2011
The empirical formulas of four cupric hydrates are determined by measuring the absorbance in aqueous solution. The Beer-Lambert Law is verified by constructing a calibration curve of absorbance versus known Cu[superscript 2+](aq) concentration. A solution of the unknown hydrate is prepared by using 0.2-0.3 g of hydrate, and water is added such…
Descriptors: Chemistry, Heat, Scientific Concepts, Water