Scheme 2 - Unknown Scheme: 2 Carly Roach I. Description A)...

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Unknown Scheme: 2 Carly Roach I. Description      A) Phase, solubility, color, odor, shape II. Flame Test A) Orange flame   Na +  present (possibly K + , NH 4 + ) B) Red flame   Ca 2+  present (no Na + ) C) Purple flame   K +  present (possibly NH 4 + ) D) No change in flame color   Ca 2+ , K + , Na +  absent (possibly NH 4  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: 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 Ca 2+  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
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This note was uploaded on 07/16/2008 for the course CHM 2046L taught by Professor Horvath during the Summer '08 term at University of Florida.

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Scheme 2 - Unknown Scheme: 2 Carly Roach I. Description A)...

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