Testing for positive and negative ions
- Created by: jaaaz_v
- Created on: 20-04-15 18:20
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- Testing For Ions
- Positive
- Can use a flame test
- Different colour flames indicate different ions
- Potassium = LILAC
- Metal Ions
- Negative
- Testing for Carbonates
- Add dilute acid to the solution
- Bubble it through the limewater
- If it becomes cloudy then a carbonate is present
- Bubble it through the limewater
- Add dilute acid to the solution
- Testing for Sulphates
- Add dilute HCL and a barium chloride solution
- If a white precipitate is formed then the original compound was a sulphate
- Add dilute HCL and a barium chloride solution
- Testing for Halides
- Add dilute nitric acid
- And then a silver nitrate solution
- Chloride = WHITE precipitate
- Bromide = CREAM precipitate
- Iodide = YELLOW precipitate
- Add dilute nitric acid
- Testing for Carbonates
- Positive
- Calcium = RED
- Lithium = CRIMSON
- Barium = GREEN
- Observe the colour of the precipitate formed
- Add aqueous sodium hydroxide to the unknown solution
- Copper = BLUE
- Iron = GREEN and RED
- Calcium = White
- Sodium = YELLOW
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