Chem Lab #6 Report

Chem Lab #6 Report - Lab #6 Report: Introduction to...

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Lab #6 Report: Introduction to Spectroscopy Sarah Aistrup Sirus Saeedipour Michael Aldrighetti Hasan Naser Sec. 425 Cassie Ward
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INTRODUCTION: The purpose of this lab was to: 1. Observe how the information gathered from the spectrophotometer is correlated with the color of the solution. 2. Through preparing several dilute solutions, find the effect of concentration on absorbance. 3. Using data obtained, determine the concentration of an unknown solution. 4. Using Fe(NO 3 ) 3 and KSCN, look at the absorbance spectrum of each individually, then combined. 5. Observe another type of spectroscopy, emission spectroscopy with NaCl, LiCl, and CuCl 2 . Spectroscopy refers to the distribution of a substances' light into its fundamental colors (What is Spectroscopy). This is one of the tools employed in determining chemical identities of many molecules, today we will be observing Co(NO 3 ) 2 Cu(NO 3 ) 2 , Ni(No 3 ) 2 , and K 2 CrO 4 , among others. The colors seen by human eyes are known as visible light. These light rays are produced by the motions of electrons within atoms and molecules. . The visible light spectrum ranges from a wavelength of 400nm to 700 nm. As illustrated by the visible light spectrum below, different colors correspond to different wavelengths. Backing up for a moment, it is important to understand “properties of atoms and molecules are not governed by the same physical laws as larger objects” (Chang 276). Instead, energy is emited only in discrete quantities. This is why light can be quantitfied in wavelength. A wave is defined as a vibrating disturbance by which energy is transmitted. As waves becomes shorter, they have a higher frequency. In contrast, longer waves have a lower frequency. Visible light can be found on the same larger specrtum with types of radiation, where gamma rays have the shortest wavelength and radio waves have the largest. (Chang 278). Spectrophotometers will be used in order to collect the data for each solution, it measures the
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This note was uploaded on 04/14/2010 for the course CHEM 13891 taught by Professor Hierl during the Spring '10 term at Kansas.

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Chem Lab #6 Report - Lab #6 Report: Introduction to...

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