CH111- Lab 1

Read Chapter 5 of Skoog, et.al. (7th edition, chapter 6 in the 6th) for relevant information.

Main idea of the lab- find chloride content by mass....convert to an insoluble solid of known formula....can then calculate amount of chloride. Note that we are NOT determining the composition of the unknown either this lab OR lab 2.

Why do we care about chlorine anyway?....
For equilibria, refer back to Hill 4.3
For colloids, refer to Hill 12.10
For a hint on the carbonate interference, refer to Hill 15.5
Please consider SAFETY when washing crucibles with base following an acid wash.....a simple warning note in the procedure section of your report might be appropriate. See published reports for examples... attaching a published paper to your first report is not an exercise to determine if you own and/or know how to use a stapler.
Other than the method in Lab 2, what might be another way to analyze for chloride?
Anything which serves to decrease mass is a source of error (think transfers, solubility, etc).

Among others, topics to be sure you cover in your report: chlorine and chloride, gravimetric analysis, solubility, colloids

YOUR REPORT SHOULD "TELL A GOOD STORY" (beginning, middle, end) IN SCIENTIFIC FORMAT. USE THE SAMPLE LAB AND CHECKSHEET OR SUFFER THE CONSEQUENCES.

Send questions or comments to Professor Kolack via email (kolack AT cooper DOT edu)
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