Chemistry Rationale Group 3

Chemistry Rationale Group 3 - Sharron K. Smith Chemistry...

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Sharron K. Smith Chemistry 1021L-15 Dr. MaGee Group 3 Unknown Rationale March 6, 2008 Ions Present : Co 2+ , Ni 2+ , Al 3+ Ions Absent : Fe 3+ , Mn 2+ , Zn 2+ To an unknown solution, 6 M NaOH was added and a purple precipitate was observed. This solid is Co(OH) 2; it is insoluble according to the hydroxide solubility rule. 6 M HNO 3 was added and a peach solution was observed. The peach solution contains Co 2+ because the HNO 3 dissociated the Co(OH) 2 into its cation, Co 2+ , and anion, OH - . NaF and KSCN* were then added to the solution and a peacock blue solution was observed. The peacock blue solution is evidence that the complex ion, [Co(SCN) 4 ] 2- , was formed, confirming the presence of Co 2+ . To an unknown solution, 6 M NaOH was added and a purple precipitate was observed. This solid is Ni(OH) 2 ; it is insoluble according to the hydroxide solubility rule. 6 M HNO 3 was added and a peach solution was observed. The peach solution contains Ni 2+ because the HNO 3 dissociated the Ni(OH)
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Chemistry Rationale Group 3 - Sharron K. Smith Chemistry...

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