Chem142_Calib_Report_Gradescope_021819_PC
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School
University of Washington *
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Course
142
Subject
Chemistry
Date
Feb 20, 2024
Type
Pages
5
Uploaded by BarristerWorldFalcon8 on coursehero.com
Name:
Monserrat Diaz
Quiz Section
AC
Lab Partner:
Mia Elsberry
Student ID #:
2229660
CHEM 142 Experiment #4: Calibration Curves and an Application of Beer's Law
Goals of this lab:
•
Apply the use of a calibration curve to finding the concentration of an unknown
•
Apply the mechanics of dimensional analysis to calculate the mass of iron in a sample based on concentration of an iron-containing solution
•
Develop lab skills in operating digital pipettes, volumetric glassware, and spectrophotometers
•
Use Excel to graphically represent and interpret experimental data
•
Asses the accuracy of experimental data (compared to a known value) and identify sources of error
Your lab report will be grade on the following criteria using a poor/good/excellent rating system (see the Lab 4 Self-Assessment for more details):
•
Calculations are complete and correct, with proper use of significant figures and units
•
Data and results are careful and accurate
•
Lab report is clear, legible, and neat
•
Error analysis is well-supported and valid
•
All graphs and tables and clearly and accurately labeled; entire report is typed
•
Application of skills to new situations is accurate and complete
By signing below, you certify that you have not falsified data, that you have not plagiarized any part of this lab report, and that all calculations and responses other than the reporting of raw data are your own independent work. Failure to sign this declaration will result in 5 points being deducted from your lab score.
Signature: __Monserrat Diaz______________________________________
This lab is worth 60 points: 10 points for notebook pages, 50 points for the lab report
NAME:
Monserrat Diaz
QUIZ SECTION:
AC
DATA, GRAPHS AND CALCULATIONS Creating the calibration curve:
l
max
for absorbance measurments:
513.7 nm (from Part III. B.)
Ferroin Standards:
Concentration (M)
Absorbance
(from Part III. C.)
1.25E-05
0.161
2.50E-05
0.360
3.75E-05
0.473
5.00E-05
0.608
6.25E-05
0.949
Slope of Absorbance versus concentration graph
14592 M
-1
(enter #s here so the data
y-intercept of Absorbance versus concentration graph
will correctly autofill on pg 3)
0.037
Detailed calibration equation:
(review the introductory information in the lab manual for an explanation of what is meant by a "detailed" calibration equation)
Determining the Amount of Iron in an Iron Tablet
1)
Average mass of a tablet 436
mg
2)
Mass of crushed tablet used in analysis
60.0
mg
(enter a # here so the data
will correctly autofill on pg 3)
3)
100
mL
is diluted in volumetric flask (lab manual Part II, Step 5)
4)
Volume of diluted crushed tablet solution 5
mL
transferred to the new volumetric flask (lab manual Part II, Step 6)
5)
Final volume of ferroin complex solution
100
mL
(lab manual Part II, Step 9)
6)
Absorbance of the ferroin complex solution
0.450
(enter a # here so the data
Final volume after filtered crushed tablet solution
Abs=(14592 M^-1x[ferroin(M)])+0.037
Place your calibration plot here. enought for someone else to read. This calibration plot is Abs vs. concentration of ferroin (M) (y-axis vs. x-axis)
Use the online resources if you need help figuring out how to plot a graph in Excel.
Title the graph and label the axis, including the correct units (Absorbance data is unitless). Be sure to double check your units and formatting once you print the report.
Add a Trendline to show the linear fit of your data. "display the equation on the chart", including the R
Note:
All sections of this report must be typed
y = 14592x - 0.037
R² = 0.956
0.000
0.100
0.200
0.300
0.400
0.500
0.600
0.700
0.800
0.900
1.000
0.00E+00
1.00E-05
2.00E-05
3.00E-05
4.00E-05
5.00E-05
6.00E-05
7.00E-05
Absprbance
Ferroin Concentration(M)
Absorbance
(lab manual Part III, Step C.7)
will correctly autofill on pg 3)
Your preview ends here
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