When salt concentrations are large enough we begin to see deviations from Nernstian behavior
Knowing the ionic strength of the solution we can use correction factors to help make accurate calculations
Beyond the scope of this experiment but it is important to maintain the same ionic strength for all measurements
12 Calculating Ionic Strength 13 How much KNO3 needs to be added to your dilutions
The difference in ionic strengths is .3-.03 .27
All dilutions made in 100ml volumetric flasks
KNO3 is 0.4M so
14 Parts C D Equilibrium Constants
Using concentration cells determine the value of Q.
Use Q to determine the unknown concentration
15 Part C Ksp for AgCl
Starting with 50 ml of 0.1M KCl add AgNO3 dropwise until a precipitate forms.
Combine this half-cell with one inside of your crucible containing 0.1M AgNO3
The resulting cell is
AgAg(unknown concentration) Ag(0.1 M)Ag
16 Helpful hints 17 Part D Formation Constant for Cu(NH3)42
The overall reaction is
Use the same type of arrangement as in Part C replacing Ag with Cu in the cathode half-cell
Use a table of changes to determine the concentrations of each species at the end.
The final concentration of Cu2 is the one that you will be determining.
18 Table of Changes Using Moles Assumes 30ml Cu(NO3)2 solution and 3 ml NH3 19 Safety and Waste Disposal
Two separate waste crocks in the lab
One for Silver Nitrate
One for all other solutions
Silver nitrate stains hands so be careful!
20 Before Starting
Find a partner
Check out kit from stockroom
PowerShow.com is a leading presentation/slideshow sharing website. Whether your application is business, how-to, education, medicine, school, church, sales, marketing, online training or just for fun, PowerShow.com is a great resource. And, best of all, most of its cool features are free and easy to use.
You can use PowerShow.com to find and download example online PowerPoint ppt presentations on just about any topic you can imagine so you can learn how to improve your own slides and presentations for free. Or use it to find and download high-quality how-to PowerPoint ppt presentations with illustrated or animated slides that will teach you how to do something new, also for free. Or use it to upload your own PowerPoint slides so you can share them with your teachers, class, students, bosses, employees, customers, potential investors or the world. Or use it to create really cool photo slideshows - with 2D and 3D transitions, animation, and your choice of music - that you can share with your Facebook friends or Google+ circles. That's all free as well!
For a small fee you can get the industry's best online privacy or publicly promote your presentations and slide shows with top rankings. But aside from that it's free. We'll even convert your presentations and slide shows into the universal Flash format with all their original multimedia glory, including animation, 2D and 3D transition effects, embedded music or other audio, or even video embedded in slides. All for free. Most of the presentations and slideshows on PowerShow.com are free to view, many are even free to download. (You can choose whether to allow people to download your original PowerPoint presentations and photo slideshows for a fee or free or not at all.) Check out PowerShow.com today - for FREE. There is truly something for everyone!