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F-8
6.
Suppose that the total concentration of I
2(aq)
and I3
-
(aq)
in the aqueous layer was determined to be
0.0450 M. The [I
2(CH2Cl2)
] in dichloromethane was determined to be 0.0500 M.
(a)
What is [I
2(aq)
] in the aqueous layer?
Answer: 3.33 x 10
-4
M.
(b)
What is [I3
-
(aq)
] in the aqueous layer?
Answer: 0.0447 M.
(c)
If the concentration of iodide ion added at the beginning of the experiment was 0.225 M, what
is [I
-
(aq)
] at equilibrium?
Answer: 0.180 M
(d)
What value should be reported for K
eq
?
Answer: 746
REAGENTS AND EQUIPMENT
KI3 solution (0.01x moles of I2 added to 0.1xx M KI)
CH2Cl2 (dichloromethane)
0.11x M KI (potassium iodide)
1.0 M HCl (hydrochloric acid)
0.01xx M Na2S2O3 (standardized sodium thiosulfate)
two 50 mL burets
starch solution
