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Qualitative analysis + Quantitative Analysis

Terms in this set (15)

What is the difference between qualitative analysis and Quantitative analysis ?
- Qualitative analysis deals with finding what is present such as anions , cations and gases whereas quantitative analysis deals with finding out how much is there such as titration.
Describe the two types of tests for Cations :
Flame Test :
- The Flame test involves exposing the compound to a flame and identifying the compound by the flame color produced. When the compound is heated, the electrons move to energy levels that are higher. This movement makes the ions energetically unstable and they move back into the previous energy join. As they move back, the ions release light energy.on the type of ions, this light energy is different and produces differing colors of flame.

Sodium Hydroxide Test:

- This test uses sodium hydroxide or aqueous ammonia to test and identify metal ions by the precipitation formed.
What flame colour do :

- Lithium
- Sodium
- Potassium
- Copper(II)

turn to ?
- Lithium = Red
- Sodium = Yellow
- Potassium = Lilac
- Copper(II)= Blue/green
Which two reagents are used to find cations ?
- Aqueous Sodium hydroxide
- Aqueous ammonia
What is the effect of aqueous sodium hydroxide on aluminium ?
- White ppt
- Soluble in excess giving a colourless solution
What is the effect of aqueous sodium hydroxide on ammonium ?
- Ammonia produced on warming
What is the effect of aqueous sodium hydroxide on calcium ?
- White ppt
- Insoluble in excess
What is the effect of aqueous sodium hydroxide on chromium ?
- Green ppt
- soluble in excess
What is the effect of aqueous sodium hydroxide on copper(II) ?
- Light blue ppt
- Insoluble in excess
What is the effect of aqueous sodium hydroxide on iron(II)?
- Green ppt
- insoluble in excess
What is the effect of aqueous sodium hydroxide on iron(III)?
- Red/brown ppt
- insoluble in excess
What is the effect of aqueous sodium hydroxide on zinc?
- White ppt
- soluble in excess giving colourless solution
State the 5 rules of solubility:
...
How do you get insoluble salts ?
...
How do you get soluble salts
...
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