Can I use these same six spot test reagents to identify cobalt in a unknown samp
ID: 496682 • Letter: C
Question
Can I use these same six spot test reagents to identify cobalt in a unknown sample? Yes, if your ran a cobalt nitrate standard and it yielded a different pattern of reactions or different colors than the other metals. Yes, provided it is the 2+ oxidation state. Yes, it will give similar results to iron because cobalt and iron are next to each other in the periodic table. After you have completed your reactions, how should you dispose of the liquids in your well plate? In the orange bottles in the fume hood they should be returned to the reagent containers they should be washed down the sink with plenty of waterExplanation / Answer
Question 4)First option is correct because Cobalt is a transitional metal, which is quite easy to detect from its colourful (purple/violet mostly) precipitate compounds it forms.
It forms a BLUE/VIOLET ppt which then turns to PINK on standing with Sodium Hydroxide, and a Blue/GREEN ppt with Ammonium Hydroxide, both insoluble in xs.
Further confirmatory tests are:
The RED/BROWN ppt/sol formed with Potassium Ferri(III)Cyanide solution, the green ppt formed withFerri(II)Cyanide, the black Sulphide, the Purple ppt which turns blue on heating with the Borate, and a range of PURPLE/LILAC ppt obtained by various reagents such as Carbonate, Silicate,Sulphite, and Vanadate are unique to Cobalt. The Sulphite, additionally produced a PURPLE ppt which turned brown on standing on a filter paper, and also a CLEAR PEACH/PINK solution, after filtering the ppt off. These are enough for detecting the presence of Cobalt ions in solution.
Question 5)Third option is correct,
Wash down drains with excess water
It should be noted in particular that no material on the "Red List" should ever be washed down a drain. This list is as follows:
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