Tiered Spectroscopy in the General Chemistry Laboratory

化学系正在为一年级学生开发一系列基于螺旋式学习方法的实验。光谱方法包括比色法和红外光谱分析。最初，学生们构建了一个简单的基于LED的比色计，实验LED的颜色等，并将其用于测定未知环境中铜(II)盐的浓度。同时，一种简单的红外光谱仪(IR LED)正被用来测定未知物质中乙醇的百分比。在第二层中，色度计用于确定羧酸铜及其KSP的组成。在第三层中，醇与碱的氢键的平衡常数是通过使用商用红外分光光度计来测定的。最后，学生将比色计与计算机连接，然后确定丙酮的溴化速率。

The Department of Chemistry is developing a series of experiments for first year students based upon the spiral approach to learning. The spectroscopic methods include both colorimetry and infrared spectroscopy. Initially the students construct a simple LED based colorimeter, experiment with the color of the LED, etc., and use it in the determination of the concentration of a copper (II) salt in an unknown. In parallel fashion, a simple infrared spectrometer (IR LED) is being used to determine the percentage of ethanol in an unknown. In the second tier, the colorimeter is used to determine the composition of cupric carboxylates and their Ksp. In the third tier, the equilibrium constant for the hydrogen-bonding of alcohols with bases is determined via the use of a commercial infrared spectrophotometer . Finally, the students interface the colorimeter to a computer and then determine the rate of bromination of acetone.