chemical tests

Question 1

test for halide ions

Answer 1

Add HNO3 then AgNO3 → precipitate. Then add NH3 if necessary.

Chloride: white precipitate that dissolves in dilute NH3

Bromide: cream (hehe) precipitate that dissolves in concentrated NH3

Iodide: yellow precipitate that does not dissolve in any NH3 solution

Question 2

test for ammonium NH4+

and NH3 ig

Answer 2

Add NaOH → NH3. Test for NH3….it turns red litmus paper blue

Question 3

Carbonate test

Answer 3

Add HCl to the carbonate solution → CO2. Turns limewater cloudy.

Question 4

sulphate test

Answer 4

Add BaCl2 → a white precipitate

Question 5

alcohol test

Answer 5

add acidified potassium dichromate orange → green colour change for primary and secondary alcohols

Question 6

test for alkenes

Answer 6

Add bromine water. Orange → colourless

Question 7

test for haloalkanes

Answer 7

Dissolve in ethanol, add water and then do the halide ion test

Question 8

colour of [Cu(H2O)6]2+

Answer 8

pale blue

Question 9

colour of Cu(OH)2

Answer 9

pale blue precipitate

Question 10

colour of [Cu(NH3)4(H2O)2]2+

Answer 10

dark blue

Question 11

colour of CuCl4^2-

Answer 11

yellow

Question 12

colour of Cu+ and I-

Answer 12

white precipitate and brown solution

Question 13

colour of Cu2+/Cu

Answer 13

brown solid and blue solution

Question 13

colour of CoCl4^2-

Answer 13

blue

Question 14

colour of [Cr(H2O)6]3+

Answer 14

pale green

Question 15

colour of Cr(OH)3

Answer 15

dark green ppt

Question 16

colour of [Cr(NH3)6]3+

Answer 16

purple

Question 17

colour of [Cr(OH)6]3-

Answer 17

dark green

Question 18

colour of [Mn(H20)6]2+

Answer 18

pale pink

Question 19

colour of Mn(OH)2

Answer 19

pale brown ppt

Question 20

colour of [Fe(H20)6]2+

Answer 20

pale green

Question 21

colour of Fe(OH)2

Answer 21

dark green ppt

Question 22

colour of [Fe(H20)6]3+

Answer 22

yellow

Question 23

colour of Fe(OH)3

Answer 23

orange-brown ppt

Question 24

Aldehyde or ketone test

Answer 24

add 2,4-DNPH (Brady’s reagent) → orange precipitate

Question 25

Just Aldehyde tests

Answer 25

add Tollen’s → silver mirror

Question 26

benzene test

Answer 26

add bromine water at room temp → no reaction. Not a good test! Or combustion → burns with a sooty flame.

Question 27

Esters and Amides tests

Answer 27

aint no test for this fam you got played icl bro

Question 28

order you do the analysis of ions tests

Answer 28

carbonate test sulfate test halide test