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Science
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| Number of pages / Number of words: |
3 / 833 |
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A dark blue precipitate formed which is a positive result, Fe3+ is present in this solution. Continuing procedure, Cr3+ presence was confirmed in step 9 by dissolving the precipitate with HNO3 then adding 5 drops of diphenycarbazide (dcp) solution. The supernatant was yellow then a sudden change to pretty, dark pink/purple after the first drop confirmed chromium presence...
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The reason for the color change is because chromium is reduced and dcp is oxidized. Further, along in the procedure, another positive test revealed the last ion present, Cu2+. The confirmatory test of copper revealed a positive result. This test was actually performed a couple of times to get a positive test due to skipping of a solution...
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