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How does a flame test identify certain metal ions?
ChemistryAnalytical Chemistry
Quick Answer
A flame test heats a sample and some metal ions emit characteristic colors of light. Sodium gives a strong yellow flame, while copper can produce blue-green colors.
The Full Story
When metal ions are heated, their electrons can be excited to higher energy levels. As the electrons fall back, they release light at specific wavelengths that can be seen as colors. This simple technique has long been used in qualitative analysis. It works best for some elements, especially alkali and alkaline earth metals, though sodiumβs bright yellow can overwhelm other colors.
Key Facts
1.Sodium gives yellow
2.Copper can give blue-green
3.It relies on electron excitation and emission
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"How fire reveals which metal is inside a sample"