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Microscale Quantitative Analysis of Hard Water Samples Using an Indirect Potassium Permanganate Redox Titration

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John N. Richardson , Mark T. Stauffer and Jennifer L. Henry

Department of Chemistry, Shippensburg University, Shippensburg, PA 17257

J. Chem. Educ., 2003, 80 (1), p 65

DOI: 10.1021/ed080p65

Publication Date (Web): January 1, 2003

Section:

Water

Abstract

A microscale procedure for the volumetric determination of calcium in an unknown hard water sample is reported. The experiment is accomplished via quantitative filtration and collection of calcium oxalate, which has been precipitated from the unknown sample, followed by microscale titration of the free oxalate using standardized potassium permanganate. While designed for a quantitative analysis laboratory, this experiment should also be suitable for an introductory college chemistry laboratory. Also reported are test data for the procedure, as well as data acquired by quantitative analysis students. Comparison with previous macroscale data indicates that the microscale procedure can be performed with comparable accuracy and precision, though student data indicate that the microscale procedure suffers from determinate error, most likely from loss of calcium oxalate during the filtering stage. This error leads to potential under-representation of calcium in the unknown.

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Laboratory Instruction

Keywords (Feature):

The Microscale Laboratory

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Microscale Lab

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This article has been cited by 1 ACS Journal articles (1 most recent appear below).

A Spectrophotometric Study of the Permanganate–Oxalate Reaction: An Analytical Laboratory Experiment
Gene E. Kalbus and Van T. Lieu , Lee H. Kalbus
Journal of Chemical Education2004 81 (1), 100
- A Spectrophotometric Study of the Permanganate–Oxalate Reaction: An Analytical Laboratory Experiment
  Gene E. Kalbus and Van T. Lieu , Lee H. Kalbus
  Journal of Chemical Education2004 81 (1), 100
  A spectrophotometric method has been developed to study the classic permanganate–oxalate oxidation–reduction reaction. The experiment is divided into two parts. Part I involves the determination of an unknown oxalate. This part of the experiment not only ...
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