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Determination of Free Lime in Clinker and Cement by Iodometry. An Undergraduate Experiment in Redox Titrimetry

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Oi-Wah Lau , Shiu-Fai Luk , Nina L. N. Cheng and Hoi-Yin Woo

Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong

J. Chem. Educ., 2001, 78 (12), p 1671

DOI: 10.1021/ed078p1671

Publication Date (Web): December 1, 2001

Abstract

An interesting application of the determination of acid by iodometry is proposed for the determination of free lime in clinker and cement. Free lime in the sample is first extracted with nonaqueous ethylene glycol at 70 °C for 15 minutes. The filtered suspension is reacted with a known excess of hydrochloric acid. The excess acid is determined by iodometry. The proposed method is better than the classical British Standard method in terms of speed, sensitivity, and precision. It is an excellent addition to the undergraduate analytical experiments currently available, where within a single experiment students can make use of analytical techniques such as nonaqueous extraction, filtration, and iodometry as well as some statistical methods in analysis. It also gives students an opportunity to become familiar with the cement industry. The method is suitable to be adopted for the analysis of free lime in clinker and cement in a cement plant or a commercial laboratory.