Tests for cations (Edexcel GCSE Chemistry Combined Science): Flashcards
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Cations
Cations
Positively charged ions
How cations form
How cations form
Atoms lose electrons
Purpose of flame test
Purpose of flame test
Identify metal cations by flame colour
Flame colour of
Flame colour of
Crimson red
Flame colour of
Flame colour of
Yellow
Flame colour of
Flame colour of
Lilac
Flame colour of
Flame colour of
Orange-red
Flame colour of
Flame colour of
Blue-green
Purpose of NaOH test for cations
Purpose of NaOH test for cations
Identify cations by precipitate colour
+ NaOH precipitate
+ NaOH precipitate
White (insoluble in excess)
+ NaOH precipitate
+ NaOH precipitate
White, soluble in excess NaOH
+ NaOH precipitate
+ NaOH precipitate
Blue
+ NaOH precipitate
+ NaOH precipitate
Green (turns brown on standing)
+ NaOH precipitate
+ NaOH precipitate
Brown
+ NaOH precipitate
+ NaOH precipitate
White, soluble in excess NaOH