A stoppered flask at 25 0C contains 250 ml water, 200 ml octanol, and 50 ml of air. An unknown amount of o-xylene is added to the flask and allowed to partition among the phases. After equilibrium has been established, 5.0 mg of o-xylene are measured in the water. What is the total mass of o-xylene present in the flask.I need the answer now please
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To find the total mass of o-xylene present in the flask, we need to use the concept of partition coefficients. The partition coefficient (K) represents the distribution of a solute between two immiscible phases, in this case, water and octanol.
First, we need to determine the partition coefficient of o-xylene between water and octanol. Let's assume it as Kow.
Kow = Concentration of o-xylene in octanol / Concentration of o-xylene in water
However, we don't have the concentration of o-xylene in octanol, but we can calculate it using the given information.
Concentration of o-xylene in octanol (Coctanol) = (Volume of o-xylene in octanol / Total volume of octanol) * mass of octanol
The volume of o-xylene in octanol can be calculated as follows:
Volume of o-xylene in octanol = Total volume of octanol - Volume of air in octanol
We know the total volume of octanol (200 ml) and the volume of air in octanol (50 ml).
Volume of o-xylene in octanol = 200 ml - 50 ml = 150 ml
Now we can calculate the concentration of o-xylene in octanol:
Concentration of o-xylene in octanol (Coctanol) = (150 ml / 200 ml) * mass of octanol
Next, we can use the given information to calculate the concentration of o-xylene in water:
Concentration of o-xylene in water (Cwater) = mass of o-xylene in water / Volume of water
Given: mass of o-xylene in water = 5.0 mg, Volume of water = 250 ml
Now we can substitute these values into the equation for the partition coefficient:
Kow = Coctanol / Cwater
Once we have determined the partition coefficient (Kow), we can calculate the concentration of o-xylene in octanol using the equation:
Concentration of o-xylene in octanol = Kow * Concentration of o-xylene in water
Finally, to find the total mass of o-xylene present in the flask, we need to calculate the mass of o-xylene in octanol and add it to the measured mass of o-xylene in water:
Total mass of o-xylene = mass of o-xylene in water + mass of o-xylene in octanol