Tiered Spectroscopy in the General Chemistry Laboratory

化学系正在开发一系列 一年级学生的实验基于螺旋 学习的方法。 光谱方法包括两种 比色法和红外光谱法。 最初，学生 构建一个简单的基于LED的色度计，用 LED的颜色等，并将其用于确定 铜（II）盐的浓度。 并行 时尚，一个简单的红外光谱仪（IR LED）正在使用 来测定未知物质中乙醇的含量 在 第二层，色度计用于确定 羧酸铜的组成及其Ksp. 第三 tier，氢键的平衡常数， 醇与碱是通过使用商业测定 红外分光光度计 最后，学生界面 将色度计传送到计算机，然后确定 丙酮的溴化。

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.