Question

Q: what volume of octanol is required to extract 99.9% of pyrene present in 1l of...

Q: what volume of octanol is required to extract 99.9% of pyrene present in 1l of water sample? assume thermodynamic equilibrium and a constant temperature of 25 degree celsius

Homework Answers

Answer #1

Assume only one chemical form in each phase.

D(distribution ratio) = KD = [Sorg]/[Saq]

Where Sorg/aq is the solubility in mol/L in each phase.

In this case, for a single step extraction, the fraction remaining in the organic phase is 99.9% (or 0.999 as a simple fraction) :

KD = (0.999/Vorg) / (0.001/Vaq)

KD = 999Vaq/Vorg

Vorg = 999Vaq/D

Vaq = 1 L

I don’t have a value for D (for the partition of pyrene in octanol-water ). Find in your book , replace and calculate.

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A standard analytical procedure for measuring the aqueous concentration (Cw) of a highly hydrophobic compound with...
A standard analytical procedure for measuring the aqueous concentration (Cw) of a highly hydrophobic compound with a low aqueous saturation solubility (Cwsat) is to first extract the hydrophobic compound from a large volume of water into a smaller volume of organic solvent such as octanol,and then analyze the concentration of the hydrophobic compound in the organicsolvent (Coct) .What volume of octanol is required to extract 99.9% of pyrene present in 1 L of a water sample?Assume thermodynamic equilibrium and a...
7. What volume of oxygen is required to react with 14.0 liters of propane gas to...
7. What volume of oxygen is required to react with 14.0 liters of propane gas to produce carbon dioxide and water? (unbalanced) C 3 H 8 + O 2 → CO 2 + H 2 O 8. The volume of a sample of gas measured at 26 C and 0.986 atm is 10.50 liters. What final temperature, in degrees Celsius, would be required to reduce the volume to 9.50 liters at constant pressure?
a 1.78 gram sample of an unknown gas is found to occupy a volume of .945...
a 1.78 gram sample of an unknown gas is found to occupy a volume of .945 L at a pressure of 645 mmhg and a temperature of 33 Celsius. Assume ideal Behavior the molecular weight of the unknown gas is? in units of u part B: sodium metal reacts with water to produce hydrogen gas the product gas H2 is collected over water at a temperature of 20 Celsius and a pressure of 759 mmhg. if the wet H2 gas...
0. 125 L sample of chlorine gas at 25 °C, is heated to a volume of...
0. 125 L sample of chlorine gas at 25 °C, is heated to a volume of 175 mL If the pressure remains constant, what is the final Celsius temperature?
for the following processes, state whether each of the thermodynamics quantities, q, w, delta U, and...
for the following processes, state whether each of the thermodynamics quantities, q, w, delta U, and delta H is greater than, equal to, or less than zero for the system described. Explain your answers briefly a) an ideal gas expands adiabaticalally against an external pressure of 1 bar. b) an ideal gas expands isothermally against an external pressure of 1 bar c) an ideal gas expands adiabatically into a vacuum d) a liquid at its boiling point is converted reversibly...
1.A gas is stored under 2 atm,what is the final volume of a gas if the...
1.A gas is stored under 2 atm,what is the final volume of a gas if the pressure was halved under constant temperature? 2.Calculate the density of SO2 gas at STP. 3 calculate the density of CH4 gas at 1.5 atm and 15 degree Celsius.
You fill an ice tray with water at 25 degree celsius and place it into the...
You fill an ice tray with water at 25 degree celsius and place it into the freezer. Each cube has a volume of 30 mililiters (a mass of 30 g). Assume that heat is transferred from the water in each cube in the ice cube tray to the surrounding cold air in the freezer at a constant rate of 40 J/min. You can consider that the water (whether liquid or solid) in each cube is at uniform temperature. You can...
(Q.11)A gas has a volume of 2.8 L at a temperature of 27 o C. What...
(Q.11)A gas has a volume of 2.8 L at a temperature of 27 o C. What temperature (o C) is needed to expand the volume to 15 L (P and n are held constant). (Q.12)  Combined gas law problem: A balloon is filed with 500 mL of helium at a temperature of 27 o C and 755 mm Hg. As the balloon rises in the atmosphere, the pressure and temperature drop. What volume will it have when it reaches an altitude...
For the following three processes, state whether each of the four thermodynamic quantities q, w, ΔU,...
For the following three processes, state whether each of the four thermodynamic quantities q, w, ΔU, and ΔH is greater than, equal to, or less than zero for the system described. Briefly explain your reasoning for each answer. a. Two copper bars, one initially at 80 °C and the other initially at 20 °C are brought into contact with each other in a thermally insulated compartment and then allowed to come to equilibrium. b. A sample of liquid in a...
A gas sample has a volume at 2.0 L at 0.75 atm and 25 •C. What...
A gas sample has a volume at 2.0 L at 0.75 atm and 25 •C. What is the volume of the pressure is increased to 1.75 atm at constant temperature ?
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT