unknown 1 - Unknown 2- Scheme (5A/B) Possible ions to test...

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Unknown 2- Scheme (5A/B) Possible ions to test for: Na + , K + , NH 4 + , OH - , Cl - , NO 3 - , SO 4 -2 , HSO 4 - , Al(H 2 0) 6 3 +, Mg(H 2 0) 6 2+ Things to get before starting: 16M HNO 3 , 6M NaOH, 6M HAc, 1M HNO 3 , crystals of Fe(H 2 O) 6 (NH 4 ) 2 (SO 4 ) 2, blue litmus, red litmus, 1M HCl, 3-6M NH3, 2M NaOH, .5M Na2CO3 Original Sample Tests: Flame Test: (clean wire with 16 M HNO 3 ) If flame burns ORANGE: Na+ present , K+ and NH 4 + unknown If flame burns PURPLE: K+ present, Na+ is not present , NH 4 + unknown NH 4 + Test : Add 6M NaOH to small part of sample. Hold damp red litmus paper over solution. If it changes BLUE than, NH 3 present, therefore: NH 4 + present . If it does not change blue, heat the solution and repeat. CO 3 2- and HCO 3 Orginal Sample. Treat with H30+ (1 M HCl) to observe creation of a colorless, odorless gas- CO2 Differentiate by pH- .1M CO 3 2- pH around 11.7, .1 M HCO 3 pH around 8 If sample tests positive for CO2 and is not very soluble in water, CO 3
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This note was uploaded on 04/17/2008 for the course CHM 2046L taught by Professor Horvath during the Spring '08 term at University of Florida.

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unknown 1 - Unknown 2- Scheme (5A/B) Possible ions to test...

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