The composition of colored complexes and the calculation method of the stability constant value of the programmable calculator are serious in the job method

Abstract

  Introduction The composition ratio and stability constant value of a complex are important parameters for describing the properties of the complex. These two parameters of colored complexes can be measured by spectrophotometry. There are many methods of measurement, among which the Job method (equimolar continuous change method) is one of the more commonly used methods. This method is to measure the absorbance of a solution by maintaining the concentration ratio of metal ions and complexing agents, and to determine the composition ratio of the complex by the drawing method. The data obtained by the drawing method are the two obtained when the concentration ratio difference is large. extension of a straight line segment