Determining Diffusion of Copper Sulphate in Aqueous Solvent by Simplified Diffusion-Measuring Equipment

Abstract

For purpose of obtaining the basic data to take up the diffusion of substance as a kind of teaching aids, a simplified diffusion-measuring equipment was manufactured and the diffusion of copper sulphate in the aqueous solvent was determined. The equipment was designed based on the following two points: 1.The equipment shall make quantitative determination as well as visual observation to keep the image as the teaching material. 2.The equipment shall determine the variation of concentration at a spot in the cell with time as well as the concentration gradient in the cell. The equipment comprises two blocks-A, the determination cell and B, the colorimeter for determination of concentration the photometer unit of which moves up and down along the cell. The variation of concentration at a certain spot in the cell can be, therefore, continuously determined and the concentration gradient in the cell can be determined by moving the position of photometer unit as well. The diffusion coefficients determined of copper sulphate in aqueous solvents agreed so well with those in literatures that the equipment can be used for quantitative detem血 ation.Since the equipment is based on color imetcy, it can be generally used for determining the diffusion of colored substances visually observable in aqueous solvents. It is also a useful equipment for searching adequate substances and phenomena for observation and experiment to make the diffusion teaching aids.