Precipitation Reactions Flashcards
What is the colour of Cu2+ in solution?
Pale Blue
What is the colour of Cu2+ in solution with the addition of NaOH/NH3?
Blue ppt - Cu(OH)2
What is the colour of Cu2+ in solution with the addition of excess NaOH?
NO REACTION
What is the colour of Cu2+ in solution with the addition of excess NH3?
Dark Blue ppt - [Cu(H2O)2 (NH3)4]2+
What is the colour of Fe2+ in solution?
Pale Green
What is the colour of Fe2+ in solution with the addition of NaOH/NH3?
Green ppt - Fe(OH)2
What is the colour of Fe2+ in solution with the addition of excess NaOH?
NO REACTION
What is the colour of Cu2+ in solution with the addition of excess NH3?
NO REACTION
What is the colour of Fe3+ in solution?
Yellow
What is the colour of Fe3+ in solution with the addition of NaOH/NH3?
Brown ppt - Fe(OH)3
What is the colour of Fe3+ in solution with the addition of excess NaOH?
NO REACTION
What is the colour of Fe3+ in solution with the addition of excess NH3?
NO REACTION
What is the colour of Mn2+ in solution?
Pink
What is the colour of Mn2+ in solution with the addition of NaOH/NH3?
Brown ppt - Mn(OH)2
What is the colour of Mn2+ in solution with the addition of excess NaOH?
NO REACTION
What is the colour of Mn2+ in solution with the addition of excess NH3?
NO REACTION
What is the colour of Cr3+ in solution?
GREEN (but can be disputed as violet)
What is the colour of Cr3+ in solution with the addition of NaOH/NH3?
Green-Grey ppt - Cr(OH)3
What is the colour of Cr3+ in solution with the addition of excess NaOH?
Green solution - [Cr(OH)6]3-
What is the colour of Cr3+ in solution with the addition of excess NH3?
Purple solution - [Cr(NH3)6]3+