Flashcards in Chemical Tests Deck (25)
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1
Ammonia
Red litmus paper turns blue
2
Carbon dioxide
Limewater turns milky
3
Hydrogen
Gas burns with a squeaky pop
4
Oxygen
Glowing Splint relights
5
Ammonium
Heat with NaOH
Red litmus turns blue
6
Mg2+
Flame test- no colour
Add NaOH- white ppt (insoluble in excess)
Add ammonia- white ppt (insoluble in excess)
Add NaCO3- white ppt
7
Ca2+
Flame test- brick red flame
Add NaOH- white ppt (insoluble in excess)
Add ammonia- no reaction
Add NaCO3- white ppt
8
Cu2+
Flame test- blue green flame
Add NaOH- white ppt (insoluble in excess)
9
Fe2+
Add NaOH- dark green ppt
10
Fe3+
Add NaOH- brown ppt
11
K+
Flame test- lilac flame
12
Na+
Flame test- yellow-orange flame
13
Zn2+
Add NaOH- white ppt ( soluble in excess)
Add Ammonia- white ppt (soluble in excess)
14
Al3+
Add NaOH- white ppt (soluble in excess)
15
Cr3+
Add NaOH- grey green ppt (soluble in excess to give dark green solution)
16
Pb2+
NaOH- white ppt (soluble in excess
Insoluble in excess ammonia
Add KI- yellow ppt
17
Ba2+
Flame- apple green
NaOH- no ppt
Add NaCO3- white ppt
18
Br-
Add NO2 and AGNO3- cream ppt
19
Co32-
Add acid- fizz
20
Cl-
Add NO2 and AgNO3- white ppt
21
I-
Add NO2 and AgNO3- yellow ppt
22
SO42-
Add BaCl2- white ppt
23
Aldehyde
Fehilings- brick red sol
Tollens- silver mirror
Triidomethane- yellow ppt (only ethanol)
2,4 DNP- orange ppt
24
Ketone
Triidomethane- yellow ppt
2,4 DNP- orange ppt
25
