Standard color comparison system for judging end color for common indicator for titration analysis

Abstract

The invention relates to a standard colorimetric system used in titrimetric analysis which usually uses the end point color of an indicator to carry out judgment. Standard colors are filled in a standard white back lining, under two common concentration of the standard colors, two self ultimate colors of the indicator form a naturally transferred standard chromatape, namely, a full chromatape; under the working concentration, the error between the standard color of the titrimetric reaction stoichiometric point of typical titrimetric reaction and titration end-point is minus 0.1 percent, namely, the error is plus 0.1 percent between the standard color of the primary half drop of titrant of the stoichiometric point and the titration end-point, that is the standard color of the latter half drop of titrant of the stoichiometric point, a colorimetric standard white back lining with the same texture and chroma is arranged near a bulk colorimetric standard color. The standard colorimetric system can provide evidence for an experimenter to judge the end point color in an intuitionistic manner, and lead an analyst to carry out color matching under the white back lining of coincident color tone so as to reduce errors.

Description

technical field [0001] The invention relates to a volumetric analysis method in analytical chemistry, in particular to an end point judgment in the volumetric analysis method. Background technique [0002] Volumetric analysis (ie titration analysis) in analytical chemistry is an extremely important classical analysis method, which occupies an important position in the teaching system of analytical chemistry, and also has important practical significance in the production practice of many industries in the national economy. In the process of titration analysis, the judgment of the progress of the chemical reaction and the end point of the titration are all realized by the color change of the indicator. However, there are a large number of various indicators, and the colors are complex and varied. Accurate determination of the end point color and maximum control of the end point error to obtain accurate and reliable analysis results are operations that must be paid special att...

AI Technical Summary

Problems solved by technology

However, in the process of teaching and production practice, we found that there are various white backings. Students often use white work clothes, a piece of white paper (different "white") or objects close to white as the backing. This leads to a large difference in white, which is prone to judgment errors, and leads to confusion in the work scene, affecting the cleanliness of the work surface

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