Using a 34.1 mg L -1 iron stock solution, a series of solutions was made as desc
ID: 880075 • Letter: U
Question
Using a 34.1 mg L-1 iron stock solution, a series of solutions was made as described on p. 49 in your lab manual. The absorptions of these solutions were measured, and the resulting data are reported below:
Vol. Fe(phen)3 used / mL
Absorption / au
0.00
0.000
0.95
0.0810
1.84
0.156
3.72
0.318
6.35
0.456
7.84
0.613
9.69
0.843
Plotting these data and fitting them to a linear function yields a line with slope 0.239 with R2 = 0.986; the plot looks like this:
What is the oxidation state of iron in the ferrous phenanthroline complex?
Vol. Fe(phen)3 used / mL
Absorption / au
0.00
0.000
0.95
0.0810
1.84
0.156
3.72
0.318
6.35
0.456
7.84
0.613
9.69
0.843
Explanation / Answer
The oxidation state of iron in the ferrous phenanthroline complex [Fe(phen)3]2+, is +2
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