Experimental techniques & chemical analysis Flashcards
1
Q
Soluble gases in water
A
- NH3
- Cl
- HCl
- SO2
2
Q
Slightly soluble gases in water
A
- O2
- CO2
3
Q
Insoluble gases in water
A
- H2
- CH4
- C2H6
4
Q
Denser gases than air
A
- Cl
- HCl
- SO2
- CO2
5
Q
Slightly denser gases than air
A
- O2
- C2H6
6
Q
Less dense gases than air
A
- NH3
- H2
- CH4
7
Q
Methods of collecting gases
A
- Displacement of water
- Upward delivery
- Downward delivery
- Gas syringe
8
Q
Displacement of water
A
insoluble / slightly soluble in water
9
Q
Upward delivery
A
less dense than air
10
Q
Downward delivery
A
denser than air
11
Q
Gas syringe
A
any gas irrespective of its solubility in water or density in air
12
Q
Collecting dry sample of gas
A
- drying agent -> H2SO4 , anhydrous CaO , anhydrous CaCl
13
Q
Separation of mixtures
A
- filtration
- decantation
- sublimation
- crystallisation
- simple distillation
- fractional distillation
- chromatography
- use of magnet
- use of separating funnel
14
Q
Solids that can sublime
A
- Ammonium chloride
- Iodine
- Solid carbon dioxide ( drikold )
15
Q
Fractional distillation
A
mixture of two / more miscible liquids with different BP can be separated
- only possible if they do not react with each other & have different BP
