パソコンと自作投げ込み式吸光度計による反応速度の測定 : 亜鉛とヨウ素の一次反応

抄録

I have devised a method of analyzing the concentration change of a solution by changing the depth of the solution by the combination of a personal computer, a self-made throwing-type colorimeter, and a PIC-ADC adaptor. This method can give us the reaction rate, and in addition, the activated energy from the temperature dependence of the reaction rates. A teacher or a training assistant can make an experimental device within only a few hours. Because operation to use the spectrophotometer is not required at all, we can concentrate on the experiment, and ascertain the change in the color of the solution change gradually. This experimental device is useful to analyze the reaction rate, etc. An experimental example is the kinetics of a first-order reaction of zinc and iodine. The rate of this reaction was analyzed by means of checking the change of concentration of iodine from the reddish brown depth of the iodine solution, aided by this self-made instrument. The activated energy seen for this reaction was 21.0kJ/mol.