flame tests

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6 Terms

1
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method

  • dip a clean nichrome wire into concentrated HCl

  • dip into the sample of solid

  • heat in blue bunsen flame

2
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g1 flame colours

Li+ : crimson red

Na+ : yellow/orange

K+ : lilac

Rb+ : red /purple

Cs+ : blue/violet

3
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g2 flame colours

Ca2+ : brick red

Sr2+ : crimson red

Ba2+ : apple green

4
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why is conc HCl used?

produces a clearer flame colour

5
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theory behind flame tests

electrons have specific energy levels, when electrons gain energy, they become excited and they can jump to higher energy levels, when they lose energy and return to their ground state, the energy is given off as visible light energy which corresponds to specific wavelength colours

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