Part I: Quantitatively Analyzing the Emission Spectra for Hydrogen and Helium Part II: Qualitatively Examining the Emission Spectra for Various Metal Ions

Calibrating the Spectroscope

The calibration of your spectroscope is important to correct for methodical error. This is done by comparing your experimentally- determined wavelengths to wavelengths obtained from the literature. A convenient source of emission lines is the helium discharge tube.


Proceed to the terminal through the helium tube in the power supply. Look through the eyeitem of your spectroscope and also discover the 6 helium lines. Note the place of these lines via regard to the range and document their colors and also their wavelengths in Angstroms in your laboratory notebook.

You are watching: Why was the emission spectrum of mercury used to calibrate the spectroscope


Readings are dependent on the position of your eye. Thus, one person must take the readings and also must be continuous via the position of their eye relative to the eyeitem.

Prepare a calibration plot by graphing the range reading obtained experimentally on the x axis versus the literary works wavesize worth on the y axis. You need to use a complete sheet of paper for the plot. This plot will be supplied to calculate the corrected wavelengths for the hydrogen spectrum and will be different for each spectroscope.

See more: Why Did Railroads Have A Greater Impact On American Society Than Did Canals And Steamboats?

Therefore, take data very closely and use your own, not another group"s!

Color of Line Theoretical Wavelength in Angstroms Blue-violet 4471 Blue 4713 Green 5015 Orange 5875 Red-Orange 7065 Dark Red 7281

Here is an instance of what a calibration graph looks like.

Experipsychological vs. Theoretical Wavelengths
4471 4450
4713 4700
5015 5000
5875 5860
7065 7040
7281 7250