Chem dynamic equilibria Q

2009-02-26 7:40 am

1. The partition coefficient of iodine between tetrachloromethane and water is 70.0 at room temperature.

(a) What weight of iodine would remain in water if 2.00g of
iodine were shaken with 100.0cm^3 of water and 40.0cm^3 of
tetrachloromethane?
(b) What weight of iodine would remain in the water if the
tetrachloromethane were used in two separate 20.0cm^3
portions?

回答 (1)

老爺子

2009-02-26 8:34 am

✔ 最佳答案

[I2(CCl4)] / [I2(aq)] = 70

(a)
Let the mass of I2 remaining in water be m g.
[(2 - m)/40] / [m/100] = 70
(200 - 100m) / 40m = 70
200 - 100 m = 2800m
2900m = 200
m = 0.0690
Mass of I2 remaining in water is 0.0690 g.

(b)
Consider the first extraction:
Let the mass of I2 remaining in water be m1 g.
[(2 - m1)/20] / [m1/100] = 70
(200 - 100m1) / 20m1 = 70
200 - 100 m1 = 1400m1
1500m1 = 200
m1 = 0.133
Mass of I2 remaining in water after first extraction is 0.133 g.

Consider the second extraction:
Let the mass of I2 remaining in water be m2 g.
[(0.133 - m2)/20] / [m2/100] = 70
(13.3 - 100m2) / 20m2 = 70
13.3 - 100 m2 = 1400m2
1500m2 = 13.3
m2 = 0.00887
Mass of I2 remaining in water after first extraction is 0.00887 g.
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