qualitative analysis..identifying gases

Question 1

Oxygen
(02)

Answer 1

Colourless
and
odourless

Causes a
glowing splint to
glow brighter or
relight.

no effect on litmus paper

Question 2

Hydrogen
(H2)

Answer 2

Colourless
and
odourless

Causes a lighted
splint to make
a ‘squeaky
pop’ and be
extinguished

forms steam

Question 3

Carbon
dioxide
(CO2)

Answer 3

Colourless
and
odourless.

does not support combustion

turns blue litmus a faint red
Forms a white
precipitate
in lime water
(calcium
hydroxide
solution).

Question 4

Ammonia

Answer 4

Colourless
Pungent

Does not
burn or
support
combustion

Turns red
litmus blue

Forms dense white fumes in the presence of HCL

Question 5

nitrogen dioxide

Answer 5

Reddish-brown
Irritating

Does not
burn or
support
combustion

Turns blue
litmus red

Question 6

chlorine gas

Answer 6

Yellow green gas
Sharp choking odor
Causes moist blue litmus to turn red and then bleaches it white

Question 7

Sulfur dioxide

Answer 7

Colorless
Choking smell
Does not support combustion
Turns blue litmus red

Question 8

Water vapor

Answer 8

Colorless
Odorless
Does not support combustion
Has no effect on red or blue litmus paper does something with Cobalt paper