Test For Ions Flashcards
What’s the flame test for Lithium?
Crimson red
What’s the flame test for Sodium?
Yellow/orange
What’s the flame test for Potassium?
Lilac
What’s the flame test for Copper?
Green
What’s the flame test for Calcium?
Orange/red
What’s the method for flame tests?
Dip nichrome wire into sample
Heat the sample over a bunsen burner
Clean the wire in HCl after every test
Why is the nichrome wire cleaned in HCL after every test?
To ensure that there’s no contamination in between ions being tested
How do you test for Metal Hydroxide ions and its positive result?
Add a few drops of NaOH
Turns into a solid, cloudy precipitate
What colour precipitate does Copper II form?
Blue precipitate
What colour precipitate does Iron II form?
Green/dark brown precipitate
What colour precipitate Iron III form?
Red/orange brown precipitate
What colour precipitate does Calcium, Magnesium and Aluminium III form?
White precipitate
How would you diferentiate Calcium, Magnesium and Aluminium III?
You can do a flame test for Calcium with a positive result of orange/red flame
Aluminium III will dissolve in excess NaOH
And Magnesium will do none of the above (proccess of elimination)
How do you test for Halides?
Add Silver Nitrate and Nitric Acid and a precipitate will form
What colour precipitate will Chloride ions form?
White precipitate
