transition metals and ions
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30 Terms
What is the colour of [Fe(H₂O)₆]²⁺ in aqueous solution?
Green solution
What is the colour of [Cu(H₂O)₆]²⁺ in aqueous solution?
Blue solution
What is the colour of [Fe(H₂O)₆]³⁺ in aqueous solution?
Pale violet (appears orange due to hydrolysis)
What is the colour of [Al(H₂O)₆]³⁺ in aqueous solution?
Colourless solution
What forms when NaOH is added dropwise to [Fe(H₂O)₆]²⁺?
Green precipitate (Fe(H₂O)₄(OH)₂), darkens on standing
What forms when NaOH is added dropwise to [Cu(H₂O)₆]²⁺?
Blue precipitate (Cu(H₂O)₄(OH)₂)
What forms when NaOH is added dropwise to [Fe(H₂O)₆]³⁺?
Brown precipitate (Fe(H₂O)₃(OH)₃)
What forms when NaOH is added dropwise to [Al(H₂O)₆]³⁺?
White precipitate (Al(H₂O)₃(OH)₃)
What happens to [Fe(H₂O)₄(OH)₂] in excess NaOH?
No further reaction
What happens to [Cu(H₂O)₄(OH)₂] in excess NaOH?
No further reaction
What happens to [Fe(H₂O)₃(OH)₃] in excess NaOH?
No further reaction
What happens to [Al(H₂O)₃(OH)₃] in excess NaOH?
Re-dissolves to give colourless solution ([Al(H₂O)₂(OH)₄]⁻)
What forms when NH₃ is added dropwise to [Fe(H₂O)₆]²⁺?
Green precipitate (Fe(H₂O)₄(OH)₂), darkens on standing
What forms when NH₃ is added dropwise to [Cu(H₂O)₆]²⁺?
Blue precipitate (Cu(H₂O)₄(OH)₂)
What forms when NH₃ is added dropwise to [Fe(H₂O)₆]³⁺?
Brown precipitate (Fe(H₂O)₃(OH)₃)
What forms when NH₃ is added dropwise to [Al(H₂O)₆]³⁺?
White precipitate (Al(H₂O)₃(OH)₃)
What happens to [Fe(H₂O)₄(OH)₂] in excess NH₃?
No further reaction
What happens to [Cu(H₂O)₄(OH)₂] in excess NH₃?
Deep blue solution ([Cu(H₂O)₂(NH₃)₄]²⁺)
What happens to [Fe(H₂O)₃(OH)₃] in excess NH₃?
No further reaction
What happens to [Al(H₂O)₃(OH)₃] in excess NH₃?
No further reaction
What forms when Na₂CO₃ is added to Fe³⁺ solution?
Brown precipitate (Fe(H₂O)₃(OH)₃) + CO₂ bubbles
What forms when Na₂CO₃ is added to Fe²⁺ solution?
Green precipitate (FeCO₃)
What forms when Na₂CO₃ is added to Cu²⁺ solution?
Blue-green precipitate (CuCO₃)
What forms when Na₂CO₃ is added to Al³⁺ solution?
White precipitate (Al(H₂O)₃(OH)₃) + CO₂ bubbles
What forms when conc. HCl is added to [Fe(H₂O)₆]²⁺?
Yellow solution ([FeCl₄]²⁻)
What forms when conc. HCl is added to [Cu(H₂O)₆]²⁺?
Green solution ([CuCl₄]²⁻)
What forms when conc. HCl is added to [Fe(H₂O)₆]³⁺?
Yellow solution ([FeCl₄]⁻)
What forms when conc. HCl is added to [Al(H₂O)₆]³⁺?
Colourless solution ([AlCl₄]⁻)