Unknown 10 Scheme - o Zn 2 5 o Cu2 4 o Cr3 3-4 Liquid...

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Unknown 10 Scheme Solid Possible Ions: Al3+, Fe3+, Zn 2+, Cu2+, Cr3+ Add 2m NaOH o Ppt present: Cu(OH)2, Fe(OH)3 o Add 6M NH3 § Blue soln: Cu(NH3)42+ - Cu2+ § Red ppt: Fe(OH)3 – Fe3+ • Supernatant Liquid: Al3+, Cr3+, Zn2+ o Add 7M NH4Cl and centrifuge § Ppt present: Cr3+ (green solid) or Al3+ (white solid) • Add H2O2 and Ba(NO3)2 o Yellow ppt: BaCrO4 – Cr3+ o Liquid: add NH4Cl § Ppt: Al3+ § Supernatant Liquid add TAA and NaAc and heat • Ppt - Zn2+ • pH Test o Al3+ - 3-4 o Fe3+,- 1-2
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Unformatted text preview: o Zn 2+ - 5 o Cu2+ - 4 o Cr3+ - 3-4 Liquid Possible Ions: Al3+, Fe3+, Zn 2+, Cu2+, Cr3+ Add 6M NH3 • Supernatant Liquid: Zn 2+or Cu2+ o Add TAA and NaAc § White ppt: ZnS § Brown ppt: CuS • Add 3M H2SO4 o Supernatant Liquid: add 6M NaOH – Zn2+ o Brown ppt – Cu2+ 3+, Al3+, Fe3+ • Ppt: Cr o Add 3M NaOH § Supernatant Liquid: Cr3+, Al3+ • Add H2O2 o Yellow/orange - Cr3+ o Colorless: add NH4Cl sat’d: white/yellow – Al3+ 3+ § Ppt – Fe...
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Unknown 10 Scheme - o Zn 2 5 o Cu2 4 o Cr3 3-4 Liquid...

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