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3. Weigh into a boat 40 mg of trans-[Co(en)2Cl2]Cl for reference. Place the reference at
your workstation along side your bulk supply of green complex. As each trial is
performed scoop out roughly 40 mg by gauging it visually against your reference.
Why is the precise mass not important?
4. Since you will be working in pairs for this experiment, one student should collect data
at 80°, 75°, and 55°C while the other student should collect at 80°, 65°, and 45°C,
each according to the following procedure. Both students measure t1/2 at 80C since
the reaction is very fast at that temperature and the results may vary.
Adjust the water bath to the desired temperature with the test tube already in the
water bath. After the test tube containing the 0.5 M sulfuric acid has completely
equilibrated (5-10 min.), quickly dump a previously weighed portion of trans[Co(en)2Cl2]Cl into the test tube and swirl while holding it inside the water bath to
insure complete dissolution of the solid. Compare the color with that of the halfrea...
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- Spring '07