From: Katie Johnson (johnson5@madison.k12.wi.us)
Date: Thu Feb 20 2003 - 19:33:19 EST
I also thought the marble activity was great!
I do a reaction similar to the iodine clock reaction, but I use sodium
thiosulfate and hydrochloric acid. The students do a serial dilution with
the thiosulfate solution and time how long it takes to become so opaque
that they can no longer see a standard mark through the solution.
Katherine Johnson
Chemistry Teacher
Madison East High School
Madison, Wisconsin
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