analytical chemistry Flashcards
name the colored cations
Fe2+, Fe3+, Cu2+
what is the color of Fe2+ (ferrous)
GREEN
what is the color of Fe3+ (ferric)
YELLOW
what is the color of Cu2+ (cuprous )
BLUE
name the 2 colored anions
MnO4 1- (pink), Cr2O7 2-(orange)
what is the color of permanganate ion
pink/purple
what is the color of dichromate ion
orange
what color is FeSo4
green
what color is FeCl3
yellow
what color is Zn(NO3)2
colorless
what color is Pb(NO3)2
colorless
what color is CuSO4
BLUE
what color is Ca(NO3)2
colorless
what happens when FeSO4 reacts with NaOH/NH4OH
–> dirty green color precipitate of Fe(OH)2
–> insoluble precipitate
–> insoluble even when reacting with excess NaOH
what happens when FeCl3 reacts with NaOH/NH4OH
–> reddish-brown color precipitate of Fe(OH)3
–> remains insoluble when reacting with excess NaOH
what happens when Zn(NO3)2 reacts with NaOH/NH4OH
–> dirty gelatinous white color precipitate is formed
–> reacts with an excess of NaOH/NH4OH to form a soluble clear solution
what happens when Pb(NO3)2 reacts with NaOH/NH4OH
–> chalky white precipitate of Pb(OH)2 is formed
–> reacts with an excess of NaOH to produce a soluble clear solution
what happens when CuSO4 reacts with NaOH/NH4OH
–> pale blue color precipitate of Cu(OH)2is formed
–> reacts with an excess of NH4OH to form a soluble deep inky blue solution
what happens when Ca(NO3)2 reacts with NaOH
–> white color precipitate of Ca(OH)2 is formed which is sparingly soluble
–> reacts with an excess of NaOH to become insoluble
–> does not react with NH4OH
