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The Chemical Educator

ISSN: 1430-4171 (electronic version)

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Abstract Volume x Issue x (2006) pp 257-258

Solubility Product (Ksp) of Potassium Hydrogen Phthalate by Gravimetric Analysis

Frazier W. Nyasulu,* Stephen Bayer, Tom Leach, and John Macklin

Department of Chemistry, University of Washington, Box 351700, Seattle, WA 98195,
Received October 10, 2005. December 17, 2005.

Published online: 12 June 2006

Abstract. In this general chemistry experiment, the solubility product (Ksp) of potassium hydrogen phthalate (KHP) is determined by gravimetric analysis. Gravimetric analysis is performed on 5 mL of each of the following solutions: a saturated KHP solution, a KCl solution of “unknown” concentration, and a saturated solution of KHP made by adding KHP(s) to the KCl solution. The Ksp obtained with and without added KCl at 20 °C is 0.21 ± 0.01.

Key Words: Laboratories and Demonstrations; general chemistry; laboratory

(*) Corresponding author. (E-mail:

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Issue date: August 1, 2006

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