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Chemistry: Demo: Silver Chloride & Ammonia


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About this Lesson

  • Type: Video Tutorial
  • Length: 2:24
  • Media: Video/mp4
  • Use: Watch Online & Download
  • Access Period: Unrestricted
  • Download: MP4 (iPod compatible)
  • Size: 25 MB
  • Posted: 07/14/2009

This lesson is part of the following series:

Chemistry: Full Course (303 lessons, $198.00)
Chemistry: Equilibrium in Aqueous Solution (21 lessons, $31.68)
Chemistry: Solubility Equilibria (5 lessons, $7.92)

This lesson was selected from a broader, comprehensive course, Chemistry, taught by Professor Harman, Professor Yee, and Professor Sammakia. This course and others are available from Thinkwell, Inc. The full course can be found at The full course covers atoms, molecules and ions, stoichiometry, reactions in aqueous solutions, gases, thermochemistry, Modern Atomic Theory, electron configurations, periodicity, chemical bonding, molecular geometry, bonding theory, oxidation-reduction reactions, condensed phases, solution properties, kinetics, acids and bases, organic reactions, thermodynamics, nuclear chemistry, metals, nonmetals, biochemistry, organic chemistry, and more.

Dean Harman is a professor of chemistry at the University of Virginia, where he has been honored with several teaching awards. He heads Harman Research Group, which specializes in the novel organic transformations made possible by electron-rich metal centers such as Os(II), RE(I), AND W(0). He holds a Ph.D. from Stanford University.

Gordon Yee is an associate professor of chemistry at Virginia Tech in Blacksburg, VA. He received his Ph.D. from Stanford University and completed postdoctoral work at DuPont. A widely published author, Professor Yee studies molecule-based magnetism.

Tarek Sammakia is a Professor of Chemistry at the University of Colorado at Boulder where he teaches organic chemistry to undergraduate and graduate students. He received his Ph.D. from Yale University and carried out postdoctoral research at Harvard University. He has received several national awards for his work in synthetic and mechanistic organic chemistry.

About this Author

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We are going to look at an interesting demonstration Le Châtelier's Principle. The reaction of Silver Nitrate and Potassium Chloride to make Silver Chloride and then dissolution of the Silver Chloride, I am going to show you that. So first what I am going to do is combine solutions of potassium chloride and silver nitrate in this beaker and of course we will make the familiar milky white product, which is Silver Chloride. It is stirring here somewhat gently and now I am going to add aqueous ammonia. What happens is that Ammonia complexes the Silver and forms the Silver Ammonia complex.
Le Châtelier's Principle says that as we remove Silver from this what's going to happen is that we will form, that the Silver Chloride will dissolve to form more Chloride and more Silver. It is stirring; we have to add an amount of aqueous Ammonia to complex all of the Silver or enough of the Silver such that we no longer exceed the solubility product of Silver Chloride. You can see that it went from white to clear again. Again, Le Châtelier's Principle says that we dissolve the Silver Chloride that was in the container and reformed free Chloride ion and now in solution what we have is the Silver Ammonia complex.
Now we can reverse the process somewhat, we can use Le Châtelier's Principle again if we add Hydrochloric Acid. Hydrochloric Acid will react with the Ammonia to form ammonium chloride, which is soluble, but that is going to free up the Silver ion again. Therefore, the Silver will no longer be present predominately as the Silver Ammonia complex. What's going to happen is this - so now we are adding Hydrochloric Acid and you can see immediately we reformed Silver Chloride and it precipitated out because almost as soon as we added the Hydrochloric Acid. Again tying up the Ammonia to form an Ammonium cation we exceeded the solubility product of Silver Chloride and so we reprecipitated the Silver Chloride.
Equilibrium in Aqueous Solution
Solubility Equilibria
CIA Demonstration: Silver Chloride and Ammonia Page [1 of 1]

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