Flame Tests

 

Hazards: 

Barium salts are highly toxic.

Chemicals and Solutions: 

Flame test cation solutions (methanolic)

Materials: 

Matches

dishes with covers

Procedure: 

Place the cation solutions into dishes and ignite them with a match.  To put them out, simply cover the dish.

Barium gives a green flame

Strontium gives a red flame

Lithium gives a red flame

Calcium gives a red orange flame

Sodium gives an orange flame

Potassium give a violet flame

Hint: 

Discussion: 

The metal ions are raised to an excited state by the high temperature of the flame and then return to the ground state emitting light of characteristic frequencies.

 

To schedule a demonstration, please send an email to the demonstration lab.

 

Contact:

Eric Camp

Lecture Demonstration Technician

Bagley Hall 171

(206) 543-1606

ericcamp@uw.edu

 

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