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Unknown 11 Scheme - Unknown 11 Scheme Possible ions Na K...

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Unknown 11 Scheme Possible ions: Na+, K+, NH4+, Ca2+, Mg(HOH)62+, Al(HOH)63+, Ag+, Cu2+. Zn2+, Fe3+, Cr3+, OH-, Cl-, SO42-, HSO4-, NO3- Perform tests that can be done on pure sample Flame tests Na+ à Bushy yellow flame K+ à lavender flame Ca2+ à red/orange flame Cu2+ à green flame All other ions may still be present despite the flame colors NH4+ 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 NH3 is smelled or if the litmus turns blue à NH4+. If not, then no NH4+ is present. CO32- or HCO3- test Take dry sample in vial and add a few drops of 3M HNO3. If bubbles are observed à CO32- or HCO3- is present. If no bubbles, neither are present. Test pH to determine between the two. Dissolve samples in 10-15 mL of deionized water If solid does not dissolve, it is one of the insoluble compounds à CaCO3, Mg(OH)2, CaSO4, Ca(OH)2, MgCO3, CuO, Ag2O, CuS, Ag2S, CuCO3, Ag2CO3, AgCl, ZnS, Zn(OH)2, MgCO3, MgOH, Ag2SO4
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Centrifuge the sample, pour off the supernatant (but save) If the sample is white then perform: Flame Test
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