P2: Chemical Analysis Flashcards
Oxygen Test
Place glowing splint in test tube with oxygen, oxygen will relight the splint
Hydrogen Test
Put lit splint in gas. If hydrogen is present, there will be a squeaky pop
Carbon Dioxide Testing
Bubble it through limewater. Limewater will go cloudy.
Flame test for Lithium
Crimson flame
Flame test for Sodium
Yellow flame
Flame test for potassium
Lilac flame
Flame test for calcium
Orange-red flame
Flame test for copper
Green flame
Carbonate ions testing
Add Hydrochloric acid, if carbonate ions are present bubbles of Carbon Dioxide will form
Test for Sulfate Ions
Use acidified barium chloride. Produces a white precipitate
Testing for Chlorine ions
Use acidified silver nitrate. Halide ion test. White precipitate will form
Testing for Barium ions
Halide test, add acidified silver nitrate. Cream precipitate forms.
Testing for Iodine ions
Halide test. Add acidified silver nitrate. Yellow precipitate forms
Testing for Copper (II) ions
Cation testing. Add Sodium Hydroxide. Blue precipitate forms
Testing for Iron (II) ions.
Cation testing. Add Sodium Hydroxide. Green precipitate forms.
Testing for Iron (III) ions.
Cation testing. Add Sodium Hydroxide. Brown precipitate forms.
Testing for Calcium ions.
Cation testing. Add Sodium Hydroxide. White precipitate forms.
Testing for Magnesium ions.
Cation testing. Add Sodium Hydroxide. White precipitate forms.
Testing for Aluminium ions.
Cation testing. Add Sodium Hydroxide. White precipitate forms, but dissolves in excess Sodium Hydroxide.
How to tell the difference between Calcium, Magnesium and Aluminium after positive ions test:
Do a flame test with calcium: orange-red flame should be produced.
Aluminium: white precipitate should dissolve in excess sodium hydroxide.
Magnesium: nothing else can be done.
What element produces a crimson flame?
Lithium
What element produces a yellow flame?
Sodium
What element produces a lilac flame?
Potassium
What element produces an orange-red flame?
Calcium
What element produces a green flame?
Copper
What element produces white precipitate in Sodium Hydroxide?
Calcium, magnesium and aluminium
What element produces brown precipitate in Sodium Hydroxide?
Iron (III) ions
What element produces green precipitate in Sodium Hydroxide?
Iron (II) ions.
What element produces blue precipitate in Sodium Hydroxide?
Copper (II) ions.
What do we use acidified barium chloride to test for?
Sulfate ions
What do we use Hydrochloric acid to test for?
Carbonate ions
In acidified silver nitrate, what ion produces white precipitate?
Chlorine- ions (Cl-)
In acidified silver nitrate, what ion produces cream precipitate?
Barium- ions (Br-)
In acidified silver nitrate, what ion produces yellow precipitate?
Iodine- ions (I-)
