Solubility and Thermodynamics: An Introductory Experiment

Minimización del impacto ecológico empleando microescala en los laboratorios de enseñanza Química

“…Se desarrollaron e implementaron nuevas prácticas a nivel de microescala tomadas de experiencias de otros autores (Szafran, 1992;Brower, 1991;Schwartz, 1992;Silberman, 1996), las cuales se incorporaron a los programas de las materias (cuadro 4).…”

Matching Five White Solids to Common Chemicals: A Dissolution Calorimetry and Acid–Base Titration Experiment

“…Students need to think both inductively and deductively in the process of matching the physical and chemical properties of the given chemicals to the reference values that they have found in the literature. The current experiment can be considered as a stepping stone for students to move forward to a more advanced procedure of structural elucidation by spectroscopic techniques. There are usually three approaches to calorimetry experiments, measuring the heat of reaction, − the heat of dissolution, ,− and the heat capacity. ,− Only the first is considered a chemical property due to chemical reactions, but the latter two may be regarded as a physical property of a material. The accuracy of this experiment depends on the magnitude of the temperature change, the precision of the thermometer, and the ability of the calorimeter to insulate heat transfer between the system of interest and the environment.…”

“…There are usually three approaches to calorimetry experiments, measuring the heat of reaction, − the heat of dissolution, ,− and the heat capacity. ,− Only the first is considered a chemical property due to chemical reactions, but the latter two may be regarded as a physical property of a material. The accuracy of this experiment depends on the magnitude of the temperature change, the precision of the thermometer, and the ability of the calorimeter to insulate heat transfer between the system of interest and the environment.…”

Learning about solubility

“…K 1 ðaqÞ1NO 3 2 ðaqÞ, where KNO 3 can form crystals. From a set of experimental data of solubility and temperature, characteristic thermodynamic parameters were obtained, including the standard enthalpy and standard entropy [1].…”

“…By recording those limit concentrations at different temperatures, Silberman has proposed a very simple method to determine the equilibrium constant in the case of the dissolution reaction , where KNO 3 can form crystals. From a set of experimental data of solubility and temperature, characteristic thermodynamic parameters were obtained, including the standard enthalpy and standard entropy .…”