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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

Carboxylic acid

Na2CO3- fizzing