Lab 3 Lab Report - Matthew Mueller Sept. 5, 2007 CHEM...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Matthew Mueller Sept. 5, 2007 CHEM 207-01A CONSTRUCTION OF CALIBRATION CURVES Objective This lab involved the measurement of transmittance of a solution at different concentrations and from that data the creation of a calibration curve comparing concentration to absorbance. Then the curve was used to identify the concentration of an unknown. Procedure Observations 1. Get the 5 standard solutions from the TA. 2. Determine the transmittance of each of the 5 standard solutions and the unknown 3 times and record to 3 sig-figs. The higher the concentration the less the transmittance and the more the absorbance. 3. Take the average of the %T for each concentration and convert to absorbance. (A = -log T) 4. Plot the absorbance’s and graph the line of best fit. Data and Results Solution Concentration Transmittance Absorbance 4.0 M %T = 20.6 % 0.686
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
3.0 M %T = 24.8 % 0.606 2.0 M %T = 33.7 % 0.472 1.0 M %T = 53.1 % 0.275 5.0 M %T = 70.6 % 0.151 Unkown %T 1 = 24.3 % %T 2 = 23.7 % %T 3 = 23.9 % Avg. = 24.0 % 0.620
Background image of page 2
Graphically estimated concentration of unknown #5 = 3.11
Background image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/08/2008 for the course CHEM 207 taught by Professor Richardson during the Fall '08 term at University of Louisville.

Page1 / 3

Lab 3 Lab Report - Matthew Mueller Sept. 5, 2007 CHEM...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online