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UNKNOWN SCHEME 10 - Zn(NH 3 4 2 colorless Cu(NH 3 4 2 blue...

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CHM2046L UNKNOWN SCHEME 10 10A: pH: Description 10B pH: Description: Al(H 2 O) 6 3+ Al(H 2 O) 6 3+ Zn(H 2 O) 6 2+ Zn(H 2 O) 6 2+ Cu(H 2 O) 6 2+ Cu(H 2 O) 6 2+ Cr(H 2 O) 6 2+ Cr(H 2 O) 6 2+ Fe(H 2 O) 6 2+ Fe(H 2 O) 6 2+ Add excess 3-6 M NH 3 Precipitate o Al(OH 2 ) 3 (OH) 3 – white gel o Cr(OH 2 ) 3 (OH) 3 – grey blue solid o Fe(OH 2 ) 3 (OH) 3 red rusty solid Supernatant:
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Unformatted text preview: Zn(NH 3 ) 4 2+- colorless Cu(NH 3 ) 4 2+- blue violet o add TAA, NaAc, and heat (ZnS, CuS) Add 6 M HCl • Precipitate: CuS – black • Mixture: add NaOH o Precipitate: ZnS - white...
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