高锰酸钾法测定白云石中钙的影响机制探究

doi:10.3866/PKU.DXHX202012053

University Chemistry ›› 2021, Vol. 36 ›› Issue (9): 2012053.doi: 10.3866/PKU.DXHX202012053

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A Study on Influence Mechanism in Determination of Calcium Content in Dolomite by Potassium Permanganate Titration

Sijia Xiang¹, Guangxu Liao¹, Qizhi Yao¹^,²^,*(), Gu Jin¹, Lingling Li¹^,²

¹ School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China
² National Demonstration Center for Experimental Chemistry Education(University of Science and Technology of China), Hefei 230026, China

Received:2020-12-31 Accepted:2021-02-18 Published:2021-03-15
Contact: Qizhi Yao E-mail:qzyao@ustc.edu.cn

Abstract

Abstract:

"Determination of calcium content in dolomite" is one of the important experiments in college analytical chemistry laboratory. During the experiment, students found that the initial redox reaction rates are significantly different between the calibration experiment of potassium permanganate solution by sodium oxalate standard solution and the titration experiment of calcium oxalate formed from dolomite by the calibrated potassium permanganate solution. Based on these experimental phenomena and combined with chemistry theory mastered by students, some conjectures and explanations were put forward. After that, we guided students to design experiments to explore and verify them. Through these experiments, it can not only answer the students' doubts, but also train and improve their ability to analyze and solve problems, and thus stimulating students' interest in chemical experiment learning.

Key words: Potassium permanganate method, Redox reaction, Calcium oxalate, Influence factors, Titration rate

Sijia Xiang, Guangxu Liao, Qizhi Yao, Gu Jin, Lingling Li. A Study on Influence Mechanism in Determination of Calcium Content in Dolomite by Potassium Permanganate Titration[J].University Chemistry, 2021, 36(9): 2012053.

滴定数据	第一组	第二组	第三组	第四组
第一次溶液褪色所需时间	7 min 30 s	20 s	1 min	19 min
滴至终点消耗体积	35.30 mL	–	–	–

滴定数据	第一组	第二组	第三组	第四组
第一次溶液褪色所需时间	30 s	40 s	18 s	5 s
滴至终点消耗体积	35.45 mL	35.41 mL	35.40 mL	35.39 mL
滴定数据	第五组	第六组	第七组	第八组
第一滴溶液褪色所需时间	8 min 30 s	8 min	1 min 30 s	30 s
滴至终点消耗体积	35.30 mL	35.38 mL	35.58 mL	35.60 mL

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A Study on Influence Mechanism in Determination of Calcium Content in Dolomite by Potassium Permanganate Titration

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