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J-3
6.
(Exp E) Assume the following reaction in solution
A
(aq)
+ B
(aq)
2 C
(aq)
has a Kc = 1.0. The initial concentrations are: [A] = 0.010 M, [B] = 1.0 M, and [C] = 2.0 M.
Which of the following statements is true?
a.
Q < Kc, reaction is moving to the left
b.
Q > Kc, reaction is moving to the right
c.
Q = Kc, reaction is at equilibrium
d.
Q > Kc, reaction is moving to the left
e.
Q < Kc, reaction is moving to the right
7.
(Exp F) In this experiment, the equilibrium for the following reaction was studied:
I
2(aq)
+ I
-
(aq)
I3
-
(aq)
The titration of 30.05 mL of the aqueous layer containing a mixture of I
2(aq)
and I
-
3(aq)
required 16.20 mL
of 0.1455M S2O3²
-
, thiosulfate, solution to reach the indicator endpoint. What is the molarity of the (I2
and I3
-
)
(aq)
in the aqueous layer?
a.
0.03922 M
b.
0.07844 M
c.
0.1349 M
d.
0.1455 M
e.
0.1569 M
8.
(Exp G) A student was performing a titration of 25.96 mL of 0.4940 M CH3COOH,
acetic acid, with a NaOH, sodium hydroxide, solution of unknown concentration. The student carefully
washed the buret and rinsed it with distilled water, but neglected to coat the sides of the buret with the
NaOH solution before filling it for the titration. The titration took 25.24 mL of the NaOH solution. The
actual concentration of the NaOH would be:
a.
exactly 0.2540 M
b.
more than 0.2540 M
c.
less than 0.5080 M
d.
exactly 0.5080 M
e.
more than 0.5080 M
