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i. To the remaining neutralized solution in your tube, add equal
volumes of 0.2g KNO2 (s) and 4M KC2H3O2 (aq).
ii. Seal the tube with parafilm and shake vigorously. If a reaction is
observed, then the Co2+ cation has been confirmed.
Confirmation Tests for Cr3+ and Zn2+ ions….
5. To the liquid from Step 1,
a. Add 1 drop of the thymolphthalein indicator.
b. Add glacial acetic acid dropwise (while shaking gently) until you see
some sort of color change.
c. Place a small amount of this solution a spot plate well.
i. Add a few drops of 0.1M Pb(NO3)2 to the well. If a reaction is
observed, then the Cr3+ cation has been confirmed.
ii. To the remaining solution in the tube, add 3 drops of dithizone in
chloroform. If a reaction is observed, then the Zn2+ cation has
i. Rinse the tube containing dithizone (using acetone) into the
Dithizone Waste Container.
ii. Any remaining waste can be transferred to your waste beaker. 33 Confirmation Tests for Ca2+ and K+ ions….
6. Place a small amount o...
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This note was uploaded on 04/09/2013 for the course CHE CHE 2C taught by Professor Nasiri during the Spring '07 term at UC Davis.
- Spring '07