Separate Chemistry 2 Flashcards
What colour flame does Lithium have
Crimson
What colour flame does Sodium have
Yellow
What colour flame does Potassium have
Lilac
What colour flame does Calcium have
brick red/ orangey
What colour flame Copper have
blue-green
How to carry out a flame test
Clean a nichrome wire loop by dipping it in HCl
Then dip into metal compound and place loop into the clear blue part of a bunsen flame
What colour precipitate does aluminium form
White
But dissolves with excess NaOH
How to test for metal ions that form precipitates
Add NaOH
What colour precipitate does Calcium form
White
What colour precipitate does Copper (2) form
Blue
What colour precipitate does Iron (2) form
Green
What colour precipitate does Iron (3) form
Brown
How to test for ammonia
add NaOH solution
If present then damp red litmus will go blue
How to test for halide ions
Nitric acid and then Silver Nitrate solution
What colour precipitates do the halides form when tested
Chloride - white
Bromide - cream
Iodide - yellow
How to test for carbonates
Add dilute acid
Then use CO2 test
How to test for sulfate ions
HCl and Barium Chloride
What colour precipitate will a sulphate form
White
What does flame photometry allow us to do
Identify ions in a mixture or in a dilute solution
How is it carried out
(flame photometry)
A sample is placed in a flame
The electrons are excited and as they drop back down to their original energy level the emit energy in the form of light
This passes through a spectroscope a a line spectrum is produced