There was no presence of Mn 2 in my unknown solution Added 5 drops of water and

There was no presence of mn 2 in my unknown solution

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There was no presence of Mn 2+ in my unknown solution. Added 5 drops of water and 2 drops pf 3M HNO 3 and mixed. Then added a small portion of NaBiO 3 mixed and let is sit for a minute. After that I centrifuged it, but the solution did not turn reddish therefore indicating that there was no Mn 2+ in the unknown solution. Ba 2+ There was no presence of Ba 2+ in my unknown solution. Added 2 drops of 4M NH 4 (CH 3 CO 2 ), heated and added 5 drops of 0.5M K 2 CrO 4 . There was no sign of yellow precipitate. Added another drop of 0.5M K 2 CrO 4 but there was still o precipitate. Ca 2+ There was no presence of Ca 2+ in my unknown solution. I added 2 drops pf 15M NH 3 to make solution alkaline. Then I added 20 drops of 0.25M (NH 4 ) 2 C 2 O 4 and let it sit for several minutes to allow the formation of a white fluffy precipitate but there was no formation of precipitate, therefore there was no calcium present. Mg 2+ There was no presence of Mg 2+ in my unknown solution. I added 2 drops of 0.2M (NH 4 ) 2 SO 4 and 2 drops of 0.25M (NH 4 ) 2 C 2 O 4. Heated, centrifuged, and discarded precipitate. Added 1 drop of 6M NH 3 and 5 drops of 0.25M Na 2 HPO 4 and warmed. Once warm I let it stand for 3 minutes to check for precipitate formation. Separated supernate and washed precipitate with hot DI water
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  • Spring '08
  • SMITH

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