Laboratory and Homework Exercises in the Geochemical Kinetics of Mineral-Water Reaction: Rate Law, Arrhenius Activation Energy, and the Rate-Determining Step in the Dissolution of Halite

摘要: This exercise for mineralogy/geochemistry courses uses optical microscopy to measure the grain sizes of equant halite crystals, and time complete dissolution each grain. The required equipment is readily available in most science departments: microscopes, thermometers, stopwatches, glassware, table salt. Using hot plates, procedure can be repeated at a second, elevated temperature, allowing determination temperature dependence (Arrhenius activation energy) reaction. data generated are used homework exercises, calculate (1) simple rate law pure water; (2) coefficient that law, two different temperatures; (3) energy lab illustrate several basic principles chemical kinetics directly relevant geology, including diffusion, reaction rates, relationship between rate-determining mechanisms crystal-s...