Unknown 2 Scheme - *SCHEME FOR UKNOWN 2:* U Unknown Scheme:...

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**SCHEME FOR UKNOWN 2:** * Unknown Scheme: 2 U I. Description A) Phase, solubility, color, odor, shape A 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) D 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 B 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 pH 13: OH- present; NH4+, Al(H2O)63+, HSO4-, HCO3- not present p If unknown is an insoluble compound, use the liquid to test pH
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Unknown 2 Scheme - *SCHEME FOR UKNOWN 2:* U Unknown Scheme:...

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