Fundamentals for Chemistry-Quantitative Measurements

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1 Lab Assignment #5 Write-Up

2

General Info:
Name:
Date:

Purpose: Of Exp #5: In this experiment we will learn about the spectroscope and how it works. To learn the concept of quantitative measurements, to construct a spectroscope and, to use it for taking quantitative measurements.

Experimental Questions:
Please complete this section of your write-up as you work on the experimental portion of this lab.

1. Hold the grating several inches from your face, at an angle. Look at the grating that you will be using. Describe what you see at the grating surface. I see different color of the rainbow and when I change the angle that am holding the diffraction grating

Hold the grating up to your eye and look through it. Describe what you see. Be specific.

When I look to the light source directly, I see the rainbow either to the right or to the left of the light inlet slit.

2. Before mounting your grating, look through the opening that you made for your grating. Describe what you see across the back of your spectroscope. I see the other opening that I made to be the light inlet.

With the Grating now mounted, look through your spectroscope and describe what you see across the back of your spectroscope. Be specific. As I mentioned before, I can see the rainbow either to the right or to the left inside the box but when I look directly to the light source it look normal.

Starting at the slit and going outward, what colors do you see in the spectrum? List them all! The first color to the left of the rainbow will be dark blue or black, then purple, light blue, green, yellowish, yellow, orange, and finally red.

3. When you view the spectrum, you should be able to see a spectral image to the right of the slit and to the left of the slit. How are the spectral images the same?

The start with the same color and end with the same color also. So the one on the right start (from the close side of the light inlet) with

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