C4.2.2 Detecting Cat Ions Flashcards
What colour flame does barium produce?
Green-yellow flame
What colour flame does calcium produce?
Orange flame
What colour flame does copper produce?
Green-blue flame
What colour flame does sodium produce?
Yellow flame
Potassium ion produces what flame
Lilac flame
Lithium ion produces what flame?
Red flame
What colour flame does a strontium ion produce
Orange-red flame
What colour precipitate does a calcium ion form when added with sodium hydroxide
White precipitate that does not dissolve in excess NAOH
What colour precipitate does zinc form when added with sodium hydroxide?
It forms a white precipitate and does dissolve in excess sodium hydroxide
What colour precipitate Iron(II) ion form when added to sodium hydroxide?
Green precipitate
What colour precipitate does Iron(III) Chloride form when added to sodium hydroxide?
It forms a brown precipitate
What colour precipitate does copper form when added with sodium hydroxide?
It forms a blue precipitate
How can you test for cat ions?
You can use a precipitate test by adding the cat ion to sodium hydroxide or complete the flame test by adding the substance to a splint and lighting it on a Bunsen Burner
Why does the colour of the flame change during flame tests?
When metal ions are heated, energy is transferred to them. This makes electron jump form one shell to another. When they go back to their original shell, energy is released as radiation. That is why you see light and a visible colour change.
What is a precipitate?
A insoluble solid formed by a reaction
