Zusammenfassung der Ressource
Testing for Positive and Negative
Ions
- Positive
- Flame Test
- By Heating up the compound, it
will glow a different colour
depending on the Metal Positive
Ion
- Colours
- Sodium
- Yellow
- Calcium
- Brick Red
- Lithium
- Red (Crimson)
- Potassium
- Purple (Lilac)
- Barium
- Green
- Adding Sodium Hydroxide
- By adding Sodium Hydroxide to the solution, a precipitate forms
- Make sure Compound is a Solution
- Coloured Precipitate
- Copper 2+
- Blue
- Iron 2+
- Green
- Iron 3+
- Brown
- White Precipitate
- Calcium
- Flame Test
- Brick Red
- Magnesium
- Flame Test
- Nothing
- Aluminium
- Add Excess
- Precipitate will dissolve in excess
- Negative
- Testing For Carbonates
- 1) React With An Acid
- 2) Carbon Dioxide should be produced
- 3) Bubble it through Lime Water
- Go from Colourless to Cloudy
- Halides
- 1) Add Silver Nitrate
- 2) Add Nitric Acid
- 3) Look for colours
- Chlorine
- White
- Bromine
- Cream
- Iodine
- Yellow
- Sulphates
- 1) Add Barium Chloride
- 2) Add Hydrochloric Acid
- A white precipitate will be formed after