12327140
Chemical Analysis 1
- Chromatography
- Separating technique that
separates substances based on
solubility in a particular substance
- Identifies additives/pesticides in food,dugs & alcohol,water
samples for pollution,crime investigation,inks...
- Identifies additives/pesticides in food,dugs & alcohol,water
samples for pollution,crime investigation,inks...
- Paper Chromatography
- Separates according to size of particle
- Solvent rises through paper
- Dissolves sample picture
- Small particles(more soluble) will
travel further than large particles
- Small particles(more soluble) will
travel further than large particles
- Dissolves sample picture
- Solvent rises through paper
- Retention Factor(RF Factor)
- Used to compare the components
of various other samples
- Rf=distance from the base line to the spot÷distance from base line to solvent front
- Rf=distance from the base line to the spot÷distance from base line to solvent front
- Used to compare the components
of various other samples
- Separates according to size of particle
- Separating technique that
separates substances based on
solubility in a particular substance
- Identification of gases
- Hydrogen
- A lighted splint should make a "pop" noise
- A lighted splint should make a "pop" noise
- Oxygen
- A glowing splint will relight
- A glowing splint will relight
- Carbon Dioxide
- Limewater gets cloudy if gas is present
- Limewater gets cloudy if gas is present
- Chlorine
- Makes damp blue litmus
paper turn red(indicates
chlorine is acidic),then white
- Makes damp blue litmus
paper turn red(indicates
chlorine is acidic),then white
- Hydrogen
- The Flame Test
- Place small amount of
compound in a nichrome loop
which has been cleaned with
HCL & heated
- Dip once again n HCL before taking the metal ion
- Hold loop in roaring blue flame &
flame will change colour
- Hold loop in roaring blue flame &
flame will change colour
- Dip once again n HCL before taking the metal ion
- Lithium-Crimson
- Sodium-yellow
- Potassium-lilac
- Barium-green
- Calcium-red
- Copper-green
- Copper-green
- Calcium-red
- Barium-green
- Potassium-lilac
- Sodium-yellow
- Place small amount of
compound in a nichrome loop
which has been cleaned with
HCL & heated
- Metal Hydroxides
- Solutions of aluminium,calcium &
magnesium ions with sodium
hydroxide form precipitates
- Precipitate-Insoluble solid formed in the reaction
- Copper(II)-blue
- Iron(II)-green(turns orange brown when left)
- Iron(III)-orange-brown
- Iron(III)-orange-brown
- Iron(II)-green(turns orange brown when left)
- Precipitate-Insoluble solid formed in the reaction
- Solutions of aluminium,calcium &
magnesium ions with sodium
hydroxide form precipitates
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