schemeass2 - Unknown Scheme: 2 Fair game cations: Na+, K+,...

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Unformatted text preview: Unknown Scheme: 2 Fair game cations: Na+, K+, NH4+ Fair game anions: OH-, Cl-, NO3-, SO4 2-,HSO4- I. Description A) Physical (powder, crystal ect.), color, odor, solubility II. Flame Test A) Orange flame à Na+ present (possibly K+, NH4+) B) Red flame à Ca2+ present (no Na+) C) Purple flame à K+ present (possibly NH4+) D) No change in flame color à 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 pH 9-10: HCO3- present; HSO4-, OH-, and Al(H2O)63+ not present pH 10-12: CO32- present; HSO4-, Al(H2O)63+, NH4+ not present...
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This note was uploaded on 11/21/2011 for the course CHM 2046L taught by Professor Horvath during the Spring '08 term at University of Florida.

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schemeass2 - Unknown Scheme: 2 Fair game cations: Na+, K+,...

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