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  Home > JCE Print > Journal of Chemical Education > Issues > 1998  > December  >
In the Laboratory
The Effects of Salts and Nonelectrolytes on the Solubility of Potassium Bitartrate: An Introductory Chemistry Discovery Experiment
Charles J. Marzzacco
Rhode Island College, Department of Physical Sciences, Providence, RI 02908-1991
Cover
December 1998
Vol. 75 No. 12
p. 1628
Abstract
An introductory chemistry discovery experiment on the effect of the presence of various solutes on the solubility of potassium bitartrate (KHT) is presented. Aqueous solutions of KCl, NaCl, MgSO4 and glucose with concentrations ranging from 0.0 to 0.10 M are saturated with KHT. The solubility of the KHT in these various solutions is determined by titration with standardized NaOH solution. The results show that the solubility of KHT is unaffected by changing the glucose concentration, decreases with increasing KCl concentration, and increases with increasing NaCl and MgSO4 concentration. MgSO4 causes a greater increase in solubility than does NaCl. The results are presented graphically and are interpreted in terms of the common ion effect and interionic interactions. The apparent solubility product constant is found to increase with the ionic strength of the solute. When the experiment is repeated with KCl-NaCl mixtures at a constant ionic strength, the solubility product constant does not vary with the composition of the mixture.
More Information
*  Citation
 Marzzacco, Charles J. J. Chem. Educ. 1998 75 1628.
*  Keywords
 Introductory / High School Chemistry; Laboratory Instruction; Equilibrium; Quantitative Analysis; Solutions / Solvents
*  History
 Created:
Last Updated:		 June 18, 1999
June 24, 2005
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