Aqua Metal Ions Reactions Flashcards
What is observed when NaOH is added to aqueous Fe²⁺ ions?
Green solution → Green precipitate → Brown precipitate on standing in air
What is observed when NH₃ is added to aqueous Fe²⁺ ions?
Green solution → Green precipitate → Brown precipitate on standing in air
What is observed when Na₂CO₃ is added to aqueous Fe²⁺ ions?
Green solution → Green precipitate
What is observed when NaOH is added to aqueous Cu²⁺ ions?
Blue solution → Blue precipitate
What is observed when NH₃ is added to aqueous Cu²⁺ ions?
Blue solution → Blue precipitate → Deep blue solution in excess
What is observed when Na₂CO₃ is added to aqueous Cu²⁺ ions?
Blue solution → Blue precipitate
What is observed when NaOH is added to aqueous Fe³⁺ ions?
Orange solution → Brown precipitate
What is observed when NH₃ is added to aqueous Fe³⁺ ions?
Orange solution → Brown precipitate
What is observed when Na₂CO₃ is added to aqueous Fe³⁺ ions?
Orange solution → Brown precipitate + effervescence
What is observed when NaOH is added to aqueous Al³⁺ ions?
Colourless solution → White precipitate → Re-dissolves in excess
What is observed when NH₃ is added to aqueous Al³⁺ ions?
Colourless solution → White precipitate
What is observed when Na₂CO₃ is added to aqueous Al³⁺ ions?
Colourless solution → White precipitate + effervescence
Give the equation for the reaction of a 2+ aqua ion with Na₂CO₃
[M(H₂O)₆]²⁺ + CO₃²⁻ → MCO₃(s) + 6H₂O
Give the equation for the reaction of a 3+ aqua ion with Na₂CO₃
2[M(H₂O)₆]³⁺ + 3CO₃²⁻ → M(OH)₃(H₂O)₃(s) + 3CO₂ + 3H₂O
Give the equation for the reaction of aqueous Cu²⁺ with excess NH₃
[Cu(H₂O)₆]²⁺ + 4NH₃ → [Cu(H₂O)₂(NH₃)₄]²⁺ + 4H₂O
Or
Cu(OH)₂(H₂O)₄ + 4NH₃ → [Cu(H₂O)₂(NH₃)₄]²⁺ + 2OH⁻