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  Home > JCE Print > Journal of Chemical Education > Issues > 1997  > July  >
In the Laboratory
Potentiometric Measurement of Transition Ranges and Titration Errors for Acid/Base Indicators
Paul A. Flowers
Cover
July 1997
Vol. 74 No. 7
p. 846
Abstract
Sophomore analytical chemistry courses typically devote a substantial amount of lecture time to acid/base equilibrium theory, and usually include at least one laboratory project employing potentiometric titrations. In an effort to provide students a laboratory experience that more directly supports their classroom discussions on this important topic, an experiment involving potentiometric measurement of transition ranges and titration errors for common acid/base indicators has been developed. The pH and visually-assessed color of a millimolar strong acid/base system are monitored as a function of added titrant volume, and the resultant data plotted to permit determination of the indicator's transition range and associated titration error. Student response is typically quite positive, and the measured quantities correlate reasonably well to literature values.
More Information
*  Citation
 Flowers, Paul A. J. Chem. Educ. 1997 74 846.
*  Keywords
 Analytical Chemistry, Laboratory Instruction, Acid-Base Chemistry, Titrimetry
*  History
 Created:
Last Updated:		 July 28, 1999
June 23, 2005
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