Chemical Analysis Flashcards
Lithium - flame test
Bright red
Sodium - flame test
Golden/yellow
Potassium- flame test
Lilac
Calcium- flame test
Brick red
Barium - flame test
Apple green
Copper- flame test
Green/ blue
Soluble?
- all nitrates
- all ammonium compounds
- all group 1 compounds
- most sulphates except barium, silver, calcium, lead
- most halides except silver and lead
Insoluble
-all hydroxide and carbonates except group 1 and ammonium compounds
Sodium hydroxide test- copper (II)
Light blue ppt
Sodium hydroxide test- Iron (II)
Light green ppt
Turns brown standing
Sodium hydroxide test- Iron (III)
Brown ppt
Sodium hydroxide test-ammonium
NH3 gas produced
Turns damp red litmus paper blue
Sodium hydroxide test-Aluminium
White ppt that dissolves in excess soltion
Testing for Halide lons- Chloride
White ppt
Sodium hydroxide test- calcium
White ppt that does not redissolve in excess
dilut acid added to negative ions
1. carbonate
2. sulphate
3. chloride
4. bromide
5. iodide
- carbonate=bubble +cloudy
- sulphate= n/a
- chloride= n/a
- bromide=n/a
- iodide= n/a
adding barium chloride and HCL
1. carbonate
2. sulphate
3. chloride
4. bromide
5. iodide
- carbonate- bubbles
- sulphate- white precpitate
- chloride- n/a
- bromide- n/a
- iodide- n/a
add silver nitrate with nitric acid to negative ions
1. carbonate
2. sulphate
3. chloride
4. bromide
5. iodide
- carbonate- bubbles
- sulphate-n/a
- chloride- white ppt
- bromide- cream ppt
- iodide- yellow ppt
What is flame photometry used for?
- to find concentration of ions
- measure intensity of light
- meaure intensity of solution being tested
advantages of instrumental methods of analysis over chemical metods
- fast
- sensitive
- accurate
how does flame emission spectroscopy work
measures the wavelength of the light as each ion emits light at a specific wavelength
