2CLabManual201303

C if a precipitate is present do the following i

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Unformatted text preview: lution to a clean centrifuge tube. a. Add 10 drops of 6M NaOH (shake after every 2 drops). b. Add 5 drops of 3% H2O2. Shake tube and place in hot water bath for 3 minutes. c. If a precipitate is present, do the following: i. Centrifuge the sample. ii. Check for complete precipitation (ppt) by adding a few more drops of 6M NaOH and watching for the additional formation of ppt on the top of the solution. iii. When ppt is complete, decant the supernatant liquid and SAVE this for Step 5. 2. To the ppt from the previous step, a. Add 10 drops of 6M HNO3. b. Stir the solution well and place the tube in the hot water bath for 3 minutes. c. Centrifuge (if necessary) and remove supernatant liquid. SAVE this for Step 4. 32 Confirmation Tests for the Mn2+ and Co2+ Ions 3. To the ppt from step 2, a. Add about 5 drops of 3% H2O2 (or until the ppt dissolves). b. Place in a hot water bath (using a hot plate) for about 3 minutes (or until bubbling stops). c. Place a small amount of this solution in a spot...
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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.

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