Qualitative Analysis Unknown J Lab

Qualitative Analysis Unknown J Lab - Stephanie Warner Chem...

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Unformatted text preview: Stephanie Warner Chem 153 Shidong Chu 11 November 2005 Qualitative Analysis Unknown J Purpose: To identify various ions in an unknown sample through reactions. Balanced Equations and Discussion: Cations: CuSO 4 + 2OH- → Cu(OH) 2 + SO 4 2- Fe 2 (SO 4 ) 3 + 3OH- → Fe(OH) 3 + 3SO 4 2- CuSO 4 + 2NH 3 + 2H 2 O→ Cu(OH) 2 + 2NH 4 + 2SO 4 2- Fe 2 (SO 4 ) 3 + 3NH 3 + 3H 2 O → Fe(OH) 3 + 3NH 4 + 3SO 4 2- 2CuSO 4 + 4I- → 2CuI + I 2 + 2SO 4 2- For the cations I tested my unknown with sodium hydroxide. This produced a red-brown precipitate. Fe 3+ precipitates a red-brown precipitate when reacted with NaOH so I knew my unknown contained Fe 3+ . I also knew that my unknown did not contain Al 3+ , Ni 2+ , Co 2+ , or Zn 2+ because when these ions react with sodium hydroxide they do not yield a red-brown precipitate. Then I tested my unknown with NH 3 and the reaction yielded a dark blue liquid with a brown red precipitate. Cu 2+ is the only ion out of the ones I hadn’t eliminated that produced a blue color when reacted with ammonia, so I was pretty sure that Mn 2+ was not in the unknown because the precipitate that Mn 2+ yielded when reacted with ammonia was more a black color than a red-brown . Also Fe 3+ yielded a red-brown precipitate in excess ammonia that looked the exact same color as the red-brown precipitate my unknown yielded. I wanted to do one more reaction to make sure. I tested my unknown with KI so I could test it with an Iodide Ion. This produced a yellow/reddish brown precipitate that turned red after time had passed. This was a lot like what happens when you react Cu 2+ and KI, so I knew for a fact that Cu 2+ was in the unknown. Anion: Ba 2+ + CuSO 4 → BaSO 4 + Cu 2+ 3Ba 2+ + Fe 2 (SO 4 ) 3 → 3BaSO 4 + 2 Fe 3+ 2Ag + + CuSO 4 → Ag 2 SO 4 + Cu 2+ 6Ag + + Fe 2 (SO 4 ) 3 → 3Ag 2 SO 4 + Fe 3+ For the anions I tested my unknown with barium nitrate to test it with a barium ion. This precipitated white. I knew that my anion could be SO 4 2-...
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This lab report was uploaded on 04/15/2008 for the course CHEMISTRY 153 Lab taught by Professor Riechel during the Fall '05 term at Miami University.

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Qualitative Analysis Unknown J Lab - Stephanie Warner Chem...

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