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| Abstract |
The molar solubility of sparingly soluble calcium hydroxide in water at room temperature and in
boiling water is easily determined by titration of filtered saturated solutions with standardized
hydrochloric acid solution. The apparent equilibrium constant, Ksp, can be
calculated from the molar solubility of calcium hydroxide: Ksp =
[Ca2+][OH-]2. The  for the dissolution of calcium hydroxide at each temperature is calculated from
the formula =
-RT ln(Kc).
values at two temperatures permit the calculation of  and  . This exercise utilizes
low-cost, relatively nonhazardous materials presenting few disposal problems. It reinforces the
students' understanding of the interrelationship of solubility, Ksp,
,
, and . The
significant extent of Ca(OH)2 solubility and its favorable temperature variation
provide unique conditions for the success of this experiment.
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| Supplement |
Materials for students, a sample laboratory lecture, and preparation instructions are included.
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 Contents |
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| Download |
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| More Information |
Citation |
Euler, William B.; Kirschenbaum, Louis J.; Ruekberg, Ben. J. Chem. Educ. 2000 77 1039.
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Keywords |
Equilibrium; Laboratory Instruction; Thermodynamics
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History |
Created:
Last Updated: |
July 5, 2000
August 31, 2005
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| Home > JCE Print > Journal of Chemical Education > Issues >
2000
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August
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1039
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