Chemical analysis

Cards (15)

Formulations 
useful mixtures used by following a formula, with a precise purpose
purities  
Made of one atom/element/compound
Boil/ melt at a fixed temperature
impurities  
Two or more elements/compounds/mixtures
Boil/ melt at varying temperatures
Chromatography  
Seperates substances by solubility
start line in pencil
solvent below ink
solvent front line- where solvent stops
stationary phase- filter paper
mobile phase- solvent moves
RF values 
By distance solute travels/ solvent travels
COmpared to a system to identify unknown substances
Flame test  
For cations
Nichrome wires/ splint dippes into solution and into a roaring flame
flame test result  
Na- yellow
Ca- orange
K- lilac
Cu- green
Li- crimson
Metal hydroxide test  
Metal + Sodium Hydroxide
Mg and Ca- white
Al- white then redissolves when in excess
Cu2+- blue
Iron2+- green
Iron3+- brown
Hydrogen gas test
Lighted splint held near neck of tube, splint ignites and squeeky pop sounds
Oxygen gas test 
Glowing splint relighs in tube
Carbon dioxide test  
Bubbled through limewater to turn milky/cloudy white
Chlorine test  
Damp litmus paper is bleached white
Carbonate test (anions) 
Acid + carbonate
Will bubble if carbon dioxide present
Sulfate test  
Add an acid ( not sulfuric)
Add barium chloride- positive result is white
Hallide test  
Add an acid (not any of the ones testing)
Add silver nitrate, positive result is-
Chlorine- white
Bromine- cream
Iodine- yellow