0 flash persistently or are preceded by a sign record

If absorbance values exceed 3.0, flash persistently, or are preceded by a “>” sign, record the value as “3.0 MAX”. Place
such
data points on your spreadsheet graph (hand in) but DO NOT use them in your best line fit.

A
b
s
o
r
b
a
n
c
e
G
RAPH
– B
EER
’
S
L
AW
(K
OOL
-A
ID
F
LAVOR
1); for in–lab data check only

Concentration (mg/L)
G
RAPH
– B
EER
’
S
L
AW
(K
OOL
-A
ID
F
LAVOR
2); for in–lab data check only
A
b
s
o
r
b
a
n
c
e

Concentration (mg/L)
G
RAPH
–
BEER
’
S
L
AW (E
XTRA
)
Name: _________________________ Lab Instructor:___________________
POST LAB REPORT QUESTIONS (submit to instructor when mindtap report is due)
I. Calculations (Show How You Calculated the Bulleted Items; (include units and the
correct number of significant figures)
Part A: Preparing Kool-Aid solutions
• Mass of mix 1 transferred:
• Stock solution concentration:
• First dilution’s concentration:
II. Additional Questions
1. Which wavelength choice among those available with the Vernier colorimeter
would be the best choice for a Beer’s Law experiment using strawberry Kool- Aid?
Why?
2. List your data and calculated concentrations for your two unknowns:
Kool-Aid Flavor
Std curve slope
Y-intercept Unknown
ID
Absorbance Concentration 1:
2: 3. How does the wavelength of maximum absorbance
relate to a substance’s color?
4. Do your stock solutions obey Beer’s Law, given your calibration range
equations? Why or why not?
5. How did your transferred mix mass compare to the amount listed on the
package label?
6. A lab pair’s Beer’s Law calibration graph 0.08 < A < 0.79 had a best-fit line of
A =0.013 C – 0.023. Data was: off-scale for both the stock solution and solution
#1 (10.00 mL stock diluted to 25.00 mL); solution #2 (1.00 mL stock diluted to
25.00 mL) had A = 0.85, and solution #3 (1.00 mL of solution #1 diluted to 25.00
mL) had A = 0.73. What are the concentrations of solution #3 and the stock
solution?