Reaction
|
From
|
To
|
Alkenes
and bromine water
|
orange
|
colourless
|
Alkanes
and bromine water
|
orange
|
remains
orange
|
Chlorine
with damp litmus
|
blue
|
red
thenwhite/bleached
|
Hydrogen
chloride – dry with blue litmus
|
blue
|
remains
blue
|
Hydrogen
chloride with damp blue litmus/hydrogen chloride in
water with blue litmus
|
blue
|
red
|
Hydrogen
chloride in methylbenzene with dry litmus
|
blue
|
blue
|
Test
for the presence of water – anhydrous copper sulphate
|
white
|
blue
|
Reaction
of copper with concentrated nitric acid
|
blue
solution and brown fumes
|
|
Reaction
of copper (II) salts with sodium hydroxide (test for Cu2+)
|
blue
solution and colourless solution
|
light
blue precipitate
|
Reaction
of iron(II) salts with sodium hydroxide – test for Fe2+
|
green
solution
|
green
precipitate
|
Reaction
of iron(III) salts with sodium hydroxide – test for Fe3+
|
orange
brown solution
|
red
brown precipitate
|
Sodium
chloride + nitric acid + silver nitrate – test for Cl-
|
colourless
solution
|
white
precipitate
|
Sodium
bromide + nitric acid + silver nitrate – test for Br-
|
colourless
solution
|
pale
cream precipitate
|
Sodium
iodide + nitric acid + silver nitrate – test for I-
|
colourless
solution
|
yellow
precipitate
|
Sulphate
compounds and barium chloride
|
colourless
solution
|
white
precipitate
|
Heating
copper carbonate
|
green
solid
|
black
solid
|
Zinc
or magnesium in copper sulphate solution
|
grey
metal in blue solution
|
colourless
solution and black solid
|
Magnesium
burning forming magnesium oxide
|
silvery
shiny solid
|
white
solid
|
Colours
of groups 1 and 2 compounds
|
white
solids
|
colourless
if dissolved in water
|
Hydrochloric
acid and ammonia - neutralization
|
two
colourless gases
|
white
solid
|
Chlorine
water and sodium bromide solution
|
two
colourless solutions
|
yellow
solution
|
Chlorine
water and sodium iodide solution
|
two
colourless solutions
|
brown
solution
|
Bromine
water and sodium iodide solution
|
two
colourless solutions
|
brown
solution
|
Heating
hydrated copper sulphate
|
blue
solid
|
white
solid
|
Monday, July 7, 2014
Important colour changes
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