Testing:
1) Add a few drops of NaOH to your metal solution
2) The colour of the insoluble precipitate formed indicates the metal
3) If a white precipitate forms, add excess NaOH and if there is no change, do the flame test
Results:
Calcium (Ca2+) produces a white precipitate
Copper(II) (Cu2+) produces a blue precipitate
Iron(II) (Fe2+) produces a green precipitate
Iron(III) (Fe3+) produces a brown precipitate
Aluminium (Al2+) produces a white precipitate, but forms a colourless solution with excess NaOH
Magnesium (Mg2+) produces a white precipitate
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