Flame Tests And Precipitates Flashcards
What is a cation
A positive ion
What is an anion
A negative ion
What colour flame does copper make
Green
What colour flame will sodium ions produce
Yellow
What colour flame will calcium ions
Brick red
What colour flame will lithium ions produce
Crimson
What colour flame will potassium ions produce
Lilac
What reagent do we use to test for metal ions
Sodium hydroxide NaOH
What colour precipitate will copper ions produce
Blue
What colour precipitate does magnesium ions make
White
What colour precipitate does calcium ions produce
White
What colour precipitate will aluminium ions produce
White
What colour precipitate will Fe2+ ions produce
Green
What colour precipitate will Fe3+ produce
Brown
How can u tell the difference between white precipitate of magnesium or calcium and the white precipitate of aluminium
Al3+ ions will redisolve in excess NaOH magnesium and calcium ions will not
What reagent do we use to test for sulfate ions
Acidified barium chloride
What is the formula for sulfate ions
SO4 2-
What colour precipitate do sulfate ions make in acidified barium chloride
White
What reagents do we use for a carbonate test
Acid
What is the positive test for a carbonate test
Bubbles of CO2
What happens to limewater if co2 is present
It turns cloudy
What is the test for chlorine
Damp blue litmus paper
What is the positive result for the chlorine test
Bleaches damp blue litmus paper white
How do u calculate rf value
Distance moved by dot divided by distance moved by solvent
What must we draw the start line in chromatography test with a pencil
So it doesn’t move up the page
What elements make up the halogens
Fluorine chlorine bromine iodine
What reagent t is used to test for halide ions
Acidified silver nitrate
What colour precipitate do Cl ions make with acidified silver nitrate
White
What colour precipitate do Br ions make with acidified silver nitrate
Cream
What colour precipitate do I ions make with acidified silver nitrate
Yellow
