Scheme for Unknown 5A

Scheme for Unknown 5A - Scheme for Unknown 9A/B Possible...

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Scheme for Unknown 9A/B Possible ions: - Cations: Na+, K+, NH4+, Ca2+, Mg(OH2)6 2+, Al(OH2)6 3+, Zn(OH2)6 2+, Ag(OH2)2 +, Cu(OH2)6 2+ - Anions: OH-, CO3 2-, HCO3-, SO4 2-, HSO4-, NO3-, Cl-, HS-, S2- - Possible insoluble substances: Ca(OH)2, CaSO4.2H2O, CaCO3, MgCO3, Mg(OH)2, AgCl, Ag2O, Ag2CO3, Ag2S, Ag2SO4, ZnS, ZnCO3, Zn(OH)2, CuO, CuS, CuCO3 -Alums Notes: -9A is a pure salt (contains either one cation and one anion or two cations and SO4 2- [alum]) -The insoluble substance could be one or more kinds of the above compounds. Zn(OH)2/ZnS will not be issued in the same sample (same for MgCO3/Mg(OH)2) 1) Describe sample: Phase, color, odor, crystal shape 2) Test on original sample: i) Flame test: a) Bushy yellow orange Na+ (K+, NH4+, Ca2+, Mg(H2O)6 2+, Al(H2O)6 3+ possible ) b) Red or red orange Ca2+ (No Na+, others possible) c) Purple K+ (No Na+ or Ca2+, others possible) d) Green Cu(OH2)6 2+ e) No color NH4+, Mg(H2O)6 2+, Al(H2O)6 3+ (No Na+, Ca2+, or K+) ii) NH4+ Test
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Scheme for Unknown 5A - Scheme for Unknown 9A/B Possible...

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