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Chemistry Discipline Panel Review - September 2011 (redirected from Lab 1 - Chemistry Discipline Panel Review)

Page history last edited by Catherine Weldon 12 years, 7 months ago

This page is intended for use in the review, commentary and approval process.

 

Lab Experiment 4 - Conductivity

Back to Chemistry Laboratory Index and Review Process

 

Instructions for Lab Experiment Review

 

Please keep in mind that although this lab has been designed to be completed using the RWSL interface, specific directions for manipulating RWSL equipment have not yet been included. These will be added as the RWSL modules are adapted for chemistry (at the moment most of the design is for Physics labs since that is the course that will be offered the soonest). Please evaluate this lab based on the learning activities, the level of lab work involved, & the critical thinking that this lab engenders.

 

Step A - Review Lab Experiment 5- Conductivity (this link will open a Word file)

 

 Step B - Leave your score and additional comments in the Comments field BELOW.

Comments (2)

Gina Bennett said

at 2:44 pm on Sep 26, 2011

Thanks Patricia. We'll make sure this feedback is considered in the final draft.

Gina

Patricia Goodson said

at 12:18 pm on Sep 10, 2011

I would simplify the "Theory" section to the following. The sentences about ion-pairing at higher concentrations could probably even be left out, since it doesn't seem to be an issue here.

Electrolytic conductivity is a measure of the ability of a solution to carry an electric current and depends on the concentration of ions in the solution. For a given substance, as the concentration of its ions increases, conductivity increases. This is true as long as the ions in the solution can act independently of each other. In highly concentrated solutions, effects such as ion-pairing may reduce the observed conductivity over what would be predicted theoretically.
Conductivity also depends upon the chemical identity of the ions. The conducting ability of every ion is not the same due to differences in mobility. The higher the mobility, the higher the conductivity. Of all cations, H+ has the highest mobility. Of all anions, OH- has the highest mobility.

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