precipitate reactions
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[addition of NaOH] Cu2+ initial solution colour and reaction equation and colour change
Cu2+ + 2OH- –> Cu(OH)2 blue solution to blue precipitate
[addition of NaOH] Fe2+ initial solution colour and reaction equation and colour change
Fe2+ + 2OH- –> Fe(OH)2 pale green solution to green precipitate
[addition of NaOH] Fe3+ initial solution colour and reaction equation and colour change
Fe3+ + 3OH- –> Fe(OH)3 pale yellow solution to orange brown precipitate
[addition of NaOH] Mn2+ initial solution colour and reaction equation and colour change
Mn2+ + 2OH- –> Mn(OH)2 pale pink solution to light brown precipitate
[addition of NaOH] Cr3+ initial solution colour and reaction equation and colour change
Cr3+ + 3OH- –> Cr(OH)3 violet solution to grey-green precipitate to dark green solution [with excess] formula = [Cr(OH)6]3-
[addition of NH3] Cu2+ initial solution colour and reaction equation and colour change
Cu2+ + 2OH- –> Cu(OH)2 blue solution to blue precipitate, excess = deep blue solution of [Cu(H2O)2(NH3)4]2+
[addition of NaOH] Fe2+ initial solution colour and reaction equation and colour change
Fe2+ + 2OH- –> Fe(OH)2 pale green solution to green precipitate
[addition of NH3] Fe3+ initial solution colour and reaction equation and colour change
Fe3+ + 3OH- –> Fe(OH)3 pale yellow solution to orange brown precipitate
[addition of NaOH] Mn2+ initial solution colour and reaction equation and colour change
Mn2+ + 2OH- –> Mn(OH)2 pale pink solution to light brown precipitate
[addition of NH3] Cr3+ initial solution colour and reaction equation and colour change
Cr3+ + 3OH- –> Cr(OH)3 violet solution to grey-green precipitate to purple solution [with excess] to form [Cr(NH3)6]3+