I2 is considerably more soluble in CCl4(l) than it is in H2O(l). At a certain te
ID: 502304 • Letter: I
Question
I2 is considerably more soluble in CCl4(l) than it is in H2O(l). At a certain temperature, the concentration of I2 in its saturated aqueous solution is 1.300×103 M, and the equilibrium achieved when I2 distributes itself between H2Oand CCl4 is
I2(aq)I2(CCl4),K=85.5
A 19.0-mL sample of saturated I2(aq) is shaken with 19.0 mL of CCl4. After equilibrium is established, the two liquid layers are separated. How many milligrams of I2 will be in the aqueous layer?
Express your answer to two significant figures and include the appropriate units.
Explanation / Answer
I2(aq)I2(CCl4
Moles of I2 in 19 ml water = 0.019L x 0.0013M = 2.47x10-5moles
Mass of I2 in 19 ml water = 2.47x10-5moles x 253.8g/mole = 6.26 x 10 -3g
What mass is left in the water:
6.26 x 10 -3 g = 6.26 mg
6.26 mg x 1/85.5 = 0.073 mg remains in the water after extraction