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Flame test Lab is part of general chemistry by Dr. Richard Gilbert at University of South Florida. Flame Test lab with answers
Typology: Exercises
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Name:____________KEY__________________Date:_____________________Period:_____
Background The heat from a laboratory burner will cause the ions of some elements to give off light. Electrons will absorb the heat energy from the flame and will “jump” to a higher energy level. When the electrons return to their original energy levels, this absorbed energy is released as light. Different elements absorb and release different amounts of energy and thus produce different kinds of light. This light may be visible or invisible, infrared or ultraviolet radiation. Analysis of this light can be used to identify elements and molecules. In today’s lab, we will observe the visible range of light emission.
Objectives
Materials: (per lab group) 10 ml dilute solutions of the following: Barium Chloride Calcium Chloride Lithium Chloride Potassium Chloride Sodium Chloride Strontium Chloride Unknown Solution 7 Wood Splints 1 Bunsen Burner Safety Goggles & Aprons
Procedure
Note: If chloride compounds are not available, metal nitrate compounds may be substituted.
Use dilute or approximately 0.1 M solutions
Unknowns: Number the beakers 1-12. Add solutions as follows:
Name:____________KEY__________________Date:_____________________Period:_____
Data Table
Metal Ion Flame Color Produced
Metal Ion Flame Color Produced Barium Green Potassium Lavender
Calcium Orange Sodium Yellow
Lithium Red Strontium Red
Unknown Number Flame Test Color Identity of Unknown 1, 8 Red Strontium 2, 7 Orange Calcium 3, 10 Lavender Potassium 4, 9 Green Barium 5, 12 Red Lithium 6, 11 Yellow Sodium
Questions
-34 8
8 -1 - x
14 14 14 14 1 2 3 4
x x
λ 1 = 410 nm λ 2 = 434 nm λ 3 = 486 nm λ 4 = 657 nm