chemlab unknown - UnknownScheme:

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Unknown Scheme: You can use this scheme as a guide when you are making your own. Don't just show up to class with this though. **SCHEME FOR UKNOWN 2:** Unknown Scheme: 2  I. Description A) Phase, solubility, color, odor, shape II. Flame Test A) Orange flame   Na+ present (possibly K+, NH4+) B) Red flame   Ca2+ present (no Na+) C) Purple flame   K+ present (possibly NH4+) D) No change in flame color   Ca2+, K+, Na+ absent (possibly NH4 present) III. pH Test A) Add a little bit of unknown to a small amount of neutral water B) Fill several vials with test solution and use indicators to determine pH Common pHs for Anions and Cations: pH 1.5: HSO4- present; CO32-, HCO3-, OH- not present pH 2.5: SO42- present pH 3-3.5: Al(H2O)63+ present; CO32-, HCO3-, OH- not present pH 5-6: NH4+ and/or Mg(H2O)62+ present pH 7: Cl- and/or NO3- and/or SO42- and/or K+ and/or Na+ and/or Ca2+ present
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This note was uploaded on 06/17/2011 for the course CHM 2046L taught by Professor Horvath during the Spring '08 term at University of Florida.

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chemlab unknown - UnknownScheme:

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