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WHAT IS Ksp??????

Ksp is the constant used in solubility equilibrium expressions for the dissolution of solid. These solubility equilibriums have a weakly dissociating solid, a salt, as its solute in a solution.  The Ksp helps measure how much a salt, which is considered insoluable, actually dissociates. The larger the Ksp value is, the more the salt has dissolved.


Ksp is all about solutions with salts, solutes, and solvents. Precipitates are insoluble compounds in solutions when certain ions react together.¬† Solutions mixed together can form a precipitate, which can be predicted by looking at the solubility rules.¬† Something different occurs during the dissociation of two solutions that have an ion in common.¬† For example, aqueous solutions of NaCl and AgCl have Cl in common. According to Le Chatelier’s principle, the equilibrium will shift to the right, because there is an increase of the reactant Cl. Because of the shift, there will be more products and there will be less free Cl ions existing in the solution.¬† This is the common ion effect.¬†The salt with a lower Ksp will become the precipitate first; in the example, AgCl is less soluble and has a lower Ksp number so more AgCl precipitate.



The site of the coolest AP Chemistry teacher the world has ever given to us. Presenting…MR. FONG! Tutorials, homework schedule, periodic table, homework (shudder), whatever your chemistry needs are, this site has!

Provides example of how to calculate Ksp. Lists its applications and gives more examples on how to use the solubility product in different situations.


Contains a major list of solubility product constants for common salt compounds, ordered from A-Z. Site also includes a link which explains Ksp.


Demonstrates a real-life chemistry lab experiment in which the Ksp of a certain compound is determined in a series of steps and calculations listed in the site.


Contains a vocabulary section pertaining to Solubility Equilibrium and a section which explains the relationship between solubility and Ksp. Also included in the site are two Ksp problems to which the solutions are given.


Zumdahl, Steven S., and Susan A. Zumdahl. Chemistry. ‘7th ed’. Boston: Houghton Mifflin Company, 2007. Print.

Foglino, Paul. Cracking the AP Chemistry Exam. 2009. New York: The Princeton Review, Inc., 2008. Print.

“Main Page.” Wikipedia. 2001. Web.4 Jun 2009. .

Created by: Brandon Cai, Nathan Cho, Tina Kwan & Vicki Luo

AP Chemistry 11/12/13 June 3, 2009


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