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Aurium posted: 24 Mar at 12:32 am
No flame test only is a rough guide for individual metals on their own. Lithium, calcium, strontium all have a red/ crimsion flame.
Copper is green , potassium lilac but if mixed together you wouldn’t be able to tell what caused the color.
Brian B posted: 25 Mar at 10:42 am
No. Some metal ions contribute very strongly to the color of the flame, whereas others contribute very little. For example, the lilac of K+ cannot be seen when Na+ is present, due to the intense yellow color produced by a compound containing Na+ (unless you look through blue glass.)
toink0520 posted: 28 Mar at 11:33 am
Flame tests is used to detect the presence of metal ions based on each elements characteristic emission spectrum.
However, the range of detected elements is small, and the test relies on the subjective experience of the experimenter rather than any objective measurements. The test has difficulty detecting small concentrations of some elements, while too strong a result may be produced for certain others, which tends to drown out weaker signals. Finally, the test only gives qualitative information, not quantitative data about the actual proportion of elements in the sample.
There are other tests that can be used to give you a more accurate result like precipitation tests (for halide ions), etc.