Chapter 16: Chemical Equilibria 7 of 18 Itom 7 Constents 1 Periodia Table Part A

Question

Chapter 16: Chemical Equilibria 7 of 18 Itom 7 Constents 1 Periodia Table Part A l2 is considerably more soluble in CCL,(1) than it is in H 0(0) At a certain temperature, the concentration of la in its saturated aqueous souton is 1.300 x 10 3 M. and the equibrium A 120-mL sample of saturated Ia (aq) is shaken with 120 ml of CC. After equilibrium is established, the two liquid layers are separated How many miligrams of I2 will be in the aqueous layer? Express your answer to two significant figures and include the appropriate units. achieved when Iz distributes tself between H,O and CCL lo View Available Hint(s) 1s(aa) I(CCL), K -85.5 4.6x102 mg Correct answer since both 12 and CCL are nonpolar whereas H20 is very polar Part 13 rhe 12 0-mL sample of aqueous layer from Part A is extracted with a second 120-mL portion of CCl,, how many miligrams of 1 will remain in the aqueous layer when equlitrium is reestablished? Express your answer to one significant figure and include the appropriate units

Explanation / Answer

Answer: Part B

from Part A - 0.046 mg of I2 in the water after 1st extraction

Hence, 0.046 mg of I2 * 1/85.5 =0.000538 mg I2

0.000538 mg I2 in the water after 2nd extraction

Answer: Part C

Assume,

X% of the moles moles are in water,

then (100%-X) are in CCl4,

85.5 = [(1-X) / 24 ml ] / [X/12 ml ]

85.5 =[(1-X) / 2 ] / X

85.5 X = (1-X) / 2

X = 0.00581,

which is 0.581 % of the moles are in water

0.581 % of 3.933(from part A calculation) mg of I2 = 0.0285 mg of I2

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