Atomic Emission General Chemistry 101/102 Laboratory Manual University of North Carolina at Wilmington

Atomic Emission Purpose Safety Considerations To use a simple spectroscope to observe the emission spectra of selected elements. To calculate the frequency and energy of photons observed in the emission spectra of lithium, sodium, and copper. Safety Considerations The flame emission apparatus should be used only in the hood. Immediately cleanup any spilled solutions.

Atomic Emission Procedure Use the spectroscope to observe the prominent lines in the spectrum of a fluorescent lamp. point slot at light source view here spectroscope (Boreal, Inc.) spectrum of fluorescent lamp 450 nm 570 nm

Atomic Emission Procedure Observe the flame emission spectra for Na, Li, and Cu and record the wavelength of the prominent spectral line for each element. Na Li Cu

Atomic Emission Calculations c = l n n = l c = = E = h n 570 nm Calculations c = l n n = l c = 3.00 x 108 ms-1 570 x 10-9 m 5.26 x 1014 s-1 = E = h n photon = (6.63 x 10-34 J·s) (5.26 x 1014 s-1) = 3.49 x 10-19 J photon (3.49 x 10-19 J) (6.02 x 1023 photon) photon mol E = mol = 2.10 x 105 J/mol E = 210 kJ/mol mol