 |
 |
3 of 11 |  |
 |
 |
V-3
(1.0)
4.
(Exp U) Predict which of the following acids would have the largest K
a
value?
CH3COOH, CH2BrCOOH, CHBr2COOH, CBr3COOH
a.
CH3COOH,
b.
CH2BrCOOH,
c.
CHBr2COOH,
d.
CBr3COOH
e.
all equal
(1.0)
5.
(Ex. O) In order for the reaction of KMnO
4
with oxalic acid to be quantitative, the reaction
solution must be strongly acidic. Nitric acid cannot be used to acidify the solution because:
a.
H
+
will reduce MnO
4
-
b.
H
+
will oxidize MnO
4
-
c.
NO3
-
will oxidize MnO
4
-
d.
NO3
-
will oxidize H2C2O
4
e.
NO3
-
will reduce H2C2O
4
(1.0)
6.
(Exp P) During an electrolysis experiment, the copper wire at the anode decreased in mass
from 2.145 g to 2.018 g. A current of 120.0 mA was used for 20.0 minutes and then
150.0 mA for 18.0 minutes. Using this data, what mass should be assigned for the molar
mass of copper assuming 100% efficiency.
a.
80.1 g mol
-1
b.
63.5 g mol
-1
c.
40.0 g mol
-1
d.
56.8 g mol
-1
e.
66.1 g mol
-1
