Chemical tests Flashcards
test for alkenes
bromine water
orange –> colourless
test with acidified potassium dichromate
K2Cr2O7
1 alcohol
2 alcohol
aldehyde
orange –> green
test for aldehyde
tollens
-silver mirror
fehlings
-brick red precipitate
test for carboxylic acid
-sodium carbonate
NaCO3
effervescence
[Ba]2+ ion test
H2SO4
white ppt
[SO4]2- ion test
BaCl2
white ppt
[Mg]2+ ion test
NaOH
white ppt
[OH]- ion test
MgCl2
white ppt
Cl- ion test
AgNO3
white ppt
Br- ion test
AgNO3
cream ppt
I- ion test
AgNO3
yellow ppt
AgCl ion test
Dilute NH3
AgCl ppt dissolves
AgBr ion test
Conc. NH3
AgBr ppt dissolves
[NH4]+ ion test
NaOH and heat
gas released turns
litmus paper
red –> blue
[CO3]2-
Acid
Effervescence
[Fe]2+
NaOH
green ppt –> brown
in air
[Cu]2+
NaOH
blue ppt
[Fe]3+
NaOH
brown ppt
[Al]3+
NaOH
white ppt
OR
Excess NH3
white ppts dissolves to colourless solution