[scientific]

Having some trouble with this problem

If 99.1% of a substance dissolved in 25 mL of water is extracted into 25 mL of organic solvent, then the distrbution coefficient for the substance between the organic solvent and the water is:

a. 1.01 x 10^-4
b. 1.10 x 10^-2
c. 1.00
d. 1.10 x 10²
e. 1.10 x 10⁴

[Borek]

Please read the forum rules.

[scientific]

I am not sure where to start... would the final solution amount be 50mL? I see online that:


K_d = C_{organic solvent}/C_aq


but does the question mean that I should have

((99.1%x)/25mL)/25mL water??

[mjc123]

The "solution volume" is not 50 mL. You have two solutions, each of volume 25 mL. The extraction method requires that the two solvents be immiscible.
If you start off with x g solute in 25 mL water, how much is in the organic solvent after extraction? What is the concentration of this solution? How much is left in the water? What is the concentration of this solution?