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Transition metal reactions summary
Terms in this set (17)
Cu²⁺ + NaOH
blue solution → pale blue ppt
Cu²⁺ + NH₃
pale blue solution → pale blue ppt
Cu²⁺ + NH₃ (excess)
pale blue ppt → dark blue solution
Cu²⁺ + Cl⁻
blue solution → green → yellow
Fe²⁺ + NaOH/NH₃/NH₃(excess)
pale green solution → light green ppt turns brown on exposure to air due to oxidation
Fe³⁺ + NaOH/NH₃/NH₃(excess)
pale yellow solution → orange ppt
Cr³⁺ + NaOH/NH₃
violet solution → grey-green ppt
Cr³⁺ + NH₃(excess)
violet solution → grey-green ppt which dissolves in excess NH₃ → violet solution
Mn²⁺ + NaOH/NH₃/NH₃(excess)
pale pink ppt forms which immediately turns light brown due to oxidation
Fe²⁺ oxidised to Fe³⁺ by...
Fe³⁺ reduced to Fe²⁺ by...
Cr³⁺ oxidised to CrO₄²⁻ by...
H₂O₂/ OH⁻ (hot)
CrO₄²⁻ reduced to Cr³⁺ by...
Cu²⁺ reduced to Cu⁺ by...
Disproportionation of Cu⁺ ions by...
hot dilute sulfuric acid
What reacts further with excess NaOH?
Cr(OH)₃ forming [Cr(OH)₆]³⁻
What reacts further with excess NH₃?
Cr(OH)₃ forming [Cr(NH₃)₆]³⁺
Cu(OH)₂ forming [Cu(NH₃)₄(H₂O)₂]²⁺
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