Scheme Analysis for Unknown 5

Scheme Analysis for Unknown 5 - Scheme Analysis for Unknown...

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Scheme Analysis for Unknown 5 Description o Phase, solubility, color, odor, shape Flame test o Orange flame Na + present (possibly K + , NH 4 + ) o Red flame Ca 2+ present (no Na + ) o Purple flame K + present (possibly NH 4 + ) o No change in flame color Ca 2+, K + , Na + absent (possibly NH 4 + present) PH Test o Add a little bit of unknown to a small amount of neutral water o Fill several vials with test solution and use indicators to determine pH o Common pHs for Anions and Cations: pH 1.5: HSO 4 - present; CO 3 2-, HCO 3 -, OH- not present pH 2.5: SO 4 2- present pH 3-3.5: Al(H 2 O) 6 3+ present; CO 3 2-, HCO 3 -, OH- not present pH 5-6: NH 4 + and/or Mg(H 2 O) 6 2+ present pH 7: Cl- and/or NO 3 - and/or SO 4 2- and/or K+ and/or Na+ and/or Ca2+ present pH 9-10: HCO 3 - present; HSO 4 -, OH-, and Al(H 2 O) 6 3+ not present pH 10-12: CO 3 2- present; HSO 4 -, Al(H 2 O) 6 3+, NH 4 + not present pH 13: OH- present; NH4+, Al(H 2 O) 6 3+, HSO 4 -, HCO
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This note was uploaded on 04/12/2010 for the course CHM 2046L taught by Professor Horvath during the Spring '08 term at University of Florida.

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Scheme Analysis for Unknown 5 - Scheme Analysis for Unknown...

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