Question

2. The solubility of urethane (ethyl carbamate, H2NCO2C2H5) in different solvents at room temperature is listed in the table below. (18 pts total) | Solvent | Solubility in 100 parts solvent (by weight) | | ----------- | -------------------------------------------- | | Water | 200 | | Ethanol | 125 | | Chloroform | 111 | a. Find the various distribution coefficients $K_D$ associated with the different solvents (e.g., $K_D$ = [H2NCO2C2H5]water / [H2NCO2C2H5]chloroform). Note that the ratio is dependent upon concentration of solute in solvent. (6) b. If you started with 15.6 g of urethane, what is the minimum amount of ethanol you would need to fully dissolve it? (2) c. If you measured out precise values of mass and volume but the urethane did not go into solution, what are two things you could you do to the solution (without adding additional solvent) to help it dissolve? (4) d. Would it make sense to extract the urethane from the ethanol into chloroform? Briefly explain your answer. (3) e. Would it make sense to extract the urethane from the ethanol into water? Briefly explain your answer. (3)

          2. The solubility of urethane (ethyl carbamate, H2NCO2C2H5) in different solvents at room
temperature is listed in the table below. (18 pts total)

| Solvent     | Solubility in 100 parts solvent (by weight) |
| ----------- | -------------------------------------------- |
| Water       | 200                                          |
| Ethanol     | 125                                          |
| Chloroform  | 111                                          |

a. Find the various distribution coefficients $K_D$ associated with the different solvents (e.g.,
$K_D$ = [H2NCO2C2H5]water / [H2NCO2C2H5]chloroform). Note that the ratio is dependent
upon concentration of solute in solvent. (6)

b. If you started with 15.6 g of urethane, what is the minimum amount of ethanol you
would need to fully dissolve it? (2)

c. If you measured out precise values of mass and volume but the urethane did not go into
solution, what are two things you could you do to the solution (without adding
additional solvent) to help it dissolve? (4)

d. Would it make sense to extract the urethane from the ethanol into chloroform? Briefly
explain your answer. (3)

e. Would it make sense to extract the urethane from the ethanol into water? Briefly
explain your answer. (3)

2 the solubility of urethane ethyl carbamate h2nco2c2h5 in different solvents at room temperature is listed in the table below 18 pts total solvent solubility in 100 parts solvent by weight 61357

Added by Lidia M.

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