Use the slope of the line to find the absorptivity of 2+ Cu(NH3)4 at 600 nm. 2+ Use the absorptivity from question 4 to find the molar concentration of Cu(NH3)42* in each of the unknown test solutions.
Use the slope of the line to find the absorptivity of 2+ Cu(NH3)4 at 600 nm. 2+ Use the absorptivity from question 4 to find the molar concentration of Cu(NH3)42* in each of the unknown test solutions.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Question
Please help with questions 4, 5, 6 and 7. The equation of the line is y = 0.0966x+0.205
Transcribed Image Text:V kn
mL
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
*
%T kn
A kn
Known
.22
0.21
.49
49
.62
.65
c kn
V unk
mL
20
19
18
17
16
15
14
13
12
11
10
8
*
%T
unk
A unk
unknown
48
.42
.34
• 19
24
cunk
(M)
27
c stock
(M)
Transcribed Image Text:4.
5.
6.
7.
Use the slope of the line to find the absorptivity of
Cu(NH3)4 at 600 nm.
2+
Use the absorptivity from question 4 to find the molar
concentration of Cu(NH3)4* in each of the unknown test
solutions.
From each unknown test solution, calculate the molar
concentration of copper(II) ion in the unknown stock
solution. These values should all be the same; any
difference is due to error. Find the average and the
standard deviation of the values.
Use the average molar concentration of copper in the
unknown stock solution from question 6, and the mass of
pennies per liter in the unknown stock solution, to find the
mass-percent of copper in the new penny. Use the error
calculation in question 6 to estimate the correct number of
significant figures in your final answer.
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