20 January 2015
Purpose: The purpose of this lab is to identify elements for Group I and II using the property of flame color
1. Bunsen Burner
2. Flint striker or matches
3. Water soaked wood splint
4. 6 unknown metals (salts) from Group I and II
1. Light your Bunsen burner so it has a low, hot flame.
2. You have 6 soaked wood splints, one for each substance. (Done for you.)
3. Dip one wood splint into the container of a substance collecting a small amount of substance on the end the wood splint.
4. Carefully pass the wood splint through the flame.
5. Observe the color of the flame as it changes and record the color in the data table.
6. Repeat steps 3 through 5 for each substance, three times each.
7. When you are finished clean up your lab station.
8. Return to your desk and get a select from the instructor to identify each unknown substance.
9. Answer the questions.
Data Analysis: Indentifying a substance by examining only one property is invalid because two substances could possibly share the same characteristic. For example, Calcium, Sodium, and Cobalt all have an orangeish colored flame when the element is burned. If a green line with a wavelength of 486 nm was observed in the emission spectrum of hydrogen, the energy of one photon of the green light would be 4.09 x 10^-19 J. When the element is placed into a flame, the heat of the fire burns the element,