Data Table A. Absorbances of Standard Cu
2+
Solutions
Standard Cu
2+
Solutions
Absorbance at ~600 nm
(enter to the 0.001)
1: 5.0 x 10
-4
Cu(NO
3
)
2
0.043
2: 1.0 x 10
-3
Cu(NO
3
)
2
0.060
3: 5.0 x 10
-3
Cu(NO
3
)
2
0.152
4: 1.0 x 10
-2
Cu(NO
3
)
2
0.233
Equation of Trendline
(please enter to 3 sig figs)
y =
21.7
x+
0.0260
R
2
=
0.982
Data Table B. Absorbances of Solutions Saturated with Cu(IO
3
)
2
Cu(IO
3
)
2
Saturated Solutions
Absorbance at ~600 nm
(enter to the 0.001)
[Cu
2+
]
(enter to 3 sig fig)
[IO
3
1-
]
(enter to 3 sig fig)
A: 1.0 x 10
-2
M KIO
3
.033
3.23e-4
M
.0106
M
B: 5.0 x 10
-3
M KIO
3
.043
7.83e-4
M
.00657
M
C: Deionized Water
.030
1.84e-4
M
3.68e-4
M
D: 1.0 x 10
-3
M Cu(NO
3
)
2
.038
5.53e-4
M
-8.94e-4
M
E: 5.0 x 10
-3
M Cu(NO
3
)
2
.027
4.61e-5
M
-.00991
M
Data Table C. Calculated K
sp
and Solubilities of Cu(IO
3
)
2
Cu(IO
3
)
2
Saturated Solutions
Calculated K
sp
(enter to 3 sig fig)
Calculated Solubility
(enter to 3 sig fig)
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A: 1.0 x 10
-2
M KIO
3
3.63e-8
3.21e-4
M
B: 5.0 x 10
-3
M KIO
3
3.38e-8
7.84e-4
M
C: Deionized Water
2.49e-11
1.84e-4
M
D: 1.0 x 10
-3
M Cu(NO
3
)
2
4.42e-10
-4.47e-4
M
E: 5.0 x 10
-3
M Cu(NO
3
)
2
4.53e-9
-.00495
M
Average
1.50e-8
------------
Question 4b.
The literature value for the K
sp
of Cu(IO
3
)
2
is 6.85 x 10

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- Spring '09
- FEDUCIA
- Chemistry, Solubility, M M M M, solubility increase, solubility results
-
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