Tests Flashcards
What do you see if a sulphate is present?
A white precipitate
What do you add to the sample when testing for sulphate?
Barium chloride solution
What do we add to sulphate sample before adding barium?
Hydrochloric acid
What do we add to halide ions first?
Dilute nitric acid
What do we add to test for halide ions?
Silver nitrate
What halide ion produces a white precipitate?
Chlorine
What halide ion produces a cream precipitate?
Bromine
What halide ion produces a yellow precipitate?
Iodine
Flame emission spectroscopy
When metal ions are heated the wavelengths of light they emit are specific to that metal
What does the intensity of the lines produced in flame emission spectroscopy indicate?
The concentration
The main advantage of flame emission spectroscopy
Can identify multiple different metal ions
The main advantage of flame emission spectroscopy
Can identify multiple different metal ions
Three main benefits of instrumental methods
Very accurate, very sensitive, very fast
