Colours Of Tm Flashcards
What oxidises fe2+ to fe3+
Acidified KMNO4
What is the colour change from fe2+ to fe3+
Pale green to yellow
What reduces fe3+ to fe2+
Iodine ions
What is the colour change from fe3+ to fe2+
Yellow to pale green
What does cr3+ get oxidised into
CrO4 2-
What oxidises cr3+ to crO4 2-
H2O2
Alkaline conditions
What does crO4 2- with acid produce
Cr2O7 2-
What colour change happens with the oxidation of cr3+ to crO4 2-
Dark green to yellow
What is the colour change from crO4 2- to cr2o7 2-
Yellow to orange
How is cr2o7 2- reduced to cr3+
Acidified Zn
What is Cr2O7 2- reduced into with Zn
Cr 3+
What is the colour change with cr2o7 2- to cr3+
Orange to green
How is cu2+ reduced into Cu+
Iodide ions
What is cu2+ reduced to in the presence of I-
Cu+
What is the colour change with cu2+ to Cu+
Pale blue to off white precipitate
What is the equation for Cu+ spontaneously disproportionating
2cu+ -> Cu + cu2+
What happens when cu(oh)2 reacts further with excess nh3
[cu(nh3)4(h2o)2]2+
Pale blue ppt > dark blue sol
What is the colour of [cr(h2o)6]3+
Chemically and realistically
Chemically = violet
Actually looks= green
What is the colour of [cr(oh)3]
Grey green ppt
What happens with [cr(h2o)]3+ in excess naoh
Forms cr(oh)6]3-
Grey green ppt -> Dark green solution
What happens with [cr(h2o)]3+ in excess nh3
Forms cr(nh3)6]3+
Grey green ppt -> purple
