Feasibility of Applying Digital Colorimetric Method to Experiments for Chemistry College Students: Determination of the Stability Constant of Iron(Ⅲ)-Sulfosalicylic Acid Coordination Compound
LONG Yi-Juan1**, PAN Ya-Di2, LIU Xiao-Han3
1. College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China;
2. Yunyang Experimental Middle School, Chongqing 404500, China;
3. Shijiazhuang No.17 Middle School, Shijiazhuang 050091, China
Abstract “Determination of the stability constant of iron(Ⅲ)-sulfosalicylic acid coordination compound” is an important inorganic experiment for the chemistry and chemical engineering college students. Digital colorimetric method was developed recent years by using smart phone and APP to accomplish data analysis of chemical reactions which accompany with color changes. In this work, digital colorimetric method was tried to apply to the aforementioned experiment. The condition control of the data collection, namely, the photograph process of the digital colorimetric method was investigated firstly. Then results obtained was compared with the conventional absorption spectrophotometry. Based on that, features of the application of digital colorimetric method were discussed. It was showed that digital colorimetric method had relatively low resolution to slight color difference and so should be applied to processes with relatively obvious color change.
LONG Yi-Juan, PAN Ya-Di, LIU Xiao-Han. Feasibility of Applying Digital Colorimetric Method to Experiments for Chemistry College Students: Determination of the Stability Constant of Iron(Ⅲ)-Sulfosalicylic Acid Coordination Compound[J]. Chinese Journal of Chemical Education, 2022, 43(20): 67-72.
