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Transition Metal Colour(AQA)

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rosugeso's version from 2016-05-09 21:30

Section 1

Question Answer
Fe(H2O)6 2+Green Solution
Cr(H2O)6 2+red-violet Solution
Co(H2O)6 2+pink solution
Cu(H2O)6 2+blue solution
Al(H2O)6 3+colourless solution
Fe(H2O)6 3+pale violet solution
memorize

Section 2

Question Answer
Al(H2O)6 3+ plus limited NaOHwhite ppt [Al(H2O)3(OH)3]
Fe(H2O)6 3+ plus limited NaOHbrown ppt [Fe(H2O)3(OH)3]
Cr(H2O)6 3+ plus limited NaOHgreen ppt [Cr(H2O)3(OH)3]
Co(H2O)6 2+ plus limited NaOHblue ppt (turns pink on standing then brown in air)
[Co(H2O)4(OH)2]
Fe(H2O)6 2+ plus limited NaOHGreen ppt. it turns brown with exposure in air [Fe(H2O)4(OH)2]
Cu(H2O)6 2+ plus limited NaOHblue ppt [Cu(H2O)4(OH)2]
memorize

Section 3

Question Answer
Al(H2O)6 3+ plus excess NaOHcolourless solution [Al(OH)4]-
Cr(H2O)6 3+ plus excess NaOHGreen solution [Cr(OH)6]3-
Fe(H2O)6 3+ plue excess NaOHbrown ppt [Fe(H2O)3(OH)3]
Co(H2O)6 2+ plus excess NaOHblue ppt [Co(H2O)4(OH)2]
Fe(H2O)6 2+ plus excess NaOHgreen ppt [Fe(H2O)4(OH)2]
Cu(H2O)6 2+ plus excess NaOHblue ppt [Cu(H2O)4(OH)2]
memorize

Section 4

Question Answer
Al(H2O)6 3+ plus limited NH3white ppt [Al(H2O)3(OH)3]
Fe(H2O)6 3+ plus limited NH3brown ppt [Fe(H2O)3(OH)3]
Cr(H2O)6 3+ plus limited NH3green ppt [Cr(H2O)3(OH)3]
Co(H2O)6 2+ plus limited NH3blue ppt [Co(H2O)4(OH)2]
Fe(H2O)6 2+ plus limited NH3green ppt. turns brown in air [Fe(H2O)4(OH)2]
Cu(H2O)6 2+ plus limited NH3blue ppt [Cu(H2O)4(OH)2]
memorize

Section 5

Question Answer
Cr(H2O)6 3+ plus excess NH3purple solution [Cr(NH3)6]3+
Co(H2O)6 2+ plus excess NH3pale-brown (straw) solution. turn brown/yellow in air [Co(NH3)6]2+
Cu(H2O)6 2+ plus excess NH3deep blue solution [Cu(NH3)4(H2O)2]2+
memorize

Section 6

Question Answer
Al(H2O)6 3+ plus limited Na2CO3white ppt with effervescence
Fe(H2O)6 3+ plus limited Na2CO3brown ppt with effervescence
Cr(H2O)6 3+ plus limited Na2CO3green ppt with effervescence
Co(H2O)6 2+ plus limited Na2CO3pink/ purple ppt
Fe(H2O)6 2+ plus limited Na2CO3Green ppt
Cu(H2O)6 2+ plus limited Na2CO3blue/ green ppt
memorize

Section 7

Question Answer
VO2+Yellow
VO2+Green
V3+Blue
V2+Violet
memorize

Section 8

Question Answer
CrO4 2-Orange
Cr2O7 2-Yellow
Cr3+Green
Cr2+Blue
memorize