unknown scheme 3 - Scheme 3 Possible ions: Na+, K+, NH4+,...

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Scheme 3 Possible ions: Na+, K+, NH4+, Ca2+, Mg(HOH)62+, Al(HOH)63+, Ag+, Cu2+. Zn2+, OH-, Cl-, SO42-, HSO4-, NO3- A is a pure compound: one cation, one anion, unless its an alum. Then it will have two cations and one anion, max is 3. B can be any mixture. Notes: 9A (the sample with the numerical label) is a pure salt , which means it only contains two (one cation and one anion) or three ( alums , i.e., two cations and SO 4 2 ) ions. Time limitation for 9A/9B is 120 minutes. Observe the sample o Note color, odor, and indicate whether the sample appears to be a mixture Perform tests that can be done on pure sample o Flame tests Na+ Bushy yellow flame K+ lavender flame Ca2+ red/orange flame Cu2+ green flame All other ions may still be present despite the flame colors o NH 4 + test Add 1-2 drops of 6 M NaOH to small dry sample and shake. Suspend a damp red litmus paper over the sample. If NH 3 is smelled or if the litmus turns blue NH 4 + . If not, then no NH 4 +. o CO 3 2- or HCO 3 - test Take dry sample in vial and add a few drops of 3 M HNO3. If bubbles are observed CO32- or HCO3- is present. If no bubbles, neither are present. Test pH to determine between the two
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This note was uploaded on 02/23/2011 for the course CHEM 2046L taught by Professor Horvath during the Fall '10 term at University of Florida.

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unknown scheme 3 - Scheme 3 Possible ions: Na+, K+, NH4+,...

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