# Week 7 lab Beer s Law Colorimetry Report

Pages: 4 (554 words) Published: March 29, 2015
﻿Ocean County College
Department of Chemistry
Beer’s Law & Colorimetry
Submitted by
Monika Rebalska
Date Submitted:   3/7/2015
Date Performed:  3/5/2015
Lab Section: Chem-180
Course Instructor: Cynthia Spencer
Purpose
The purpose of this experiment was to construct a Beer’s Law Plot, determine the concentration of a sample using the Beer’s law plot, and to determine the concentration of Blue Dye #1 in a commercial product using visual Colorimetry.

Procedure
This lab consisted of calculating %T of given data and constructing a Beer’s Law plow. Secondly, The Beer’s Law data was used to extrapolate the concentration of sample data for a drug. Lastly, a color standard was prepared with a known concentration to use in visual colorimetry to approximate the concentration of Blue Dye #1 in a commercial product. (P. 119-132 Jeschofnig ,n.d.).

Observations and Results
1)

Beer’s law plot and best fit line for the data in Table 1.(given below) Sample Identification Code
Sample Concentration (M)
Absorbance (%T)
Q5000
4.00 x 10-4
17.9
Q5001
3.20 x 10-4
25
Q5002
2.40 x 10-4
35.7
Q5003
1.60 x 10-4
50.2
Q5004
8.00 x 10-5
70.8

2 & 3)
Using the Beer’s law plot (above) and best fit line, the concentrations for samples: Q021015-01, Q021015-02, Q021015-03, Q021015-04 and Q021015-05 are determined. Sample Identification Code
Absorbance
Equation : A = -163750c + 79.22
Q021015-01

43.7
c
Q021015-02
44.1
c
Q021015-03
43.8
c
Q021015-04
44.1
c
Q021015-05
43.8
c

Concentration of M in batch Q021015 = average of above 5 values = 4)

The company reported that sample Q021015 has an M concentration of 3.00 x 10^-4 M. Assuming that yours analysis is more accurate so what is their percentage error.

Reported...

References: List all your references. Be sure to use the APA format.
1.     P. Jeschofnig (n.d.). Beer’s Law and Colorimetry. General College Chemistry (n.d) p.#. 119-132 Hand-On Labs, Inc., Englewood, CO.

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