Question

Partition coefficient in two-phase aqueous extraction is defined as the concentration of solute in:

• A. Extracte/raffinate
• B. Extract/feed
• C. Upper aqueous layer/ lower aqueous layer
• D. Amount of solute extracted / amount of solute in feed

Hint:

Partition coefficient describes how a solute is distributed between two phases during extraction.

Answer 1

The Correct Option is A

Step 1: Understanding Partition Coefficient 
The partition coefficient (also called distribution coefficient) in extraction refers to the ratio of the concentration of a solute in two immiscible solvents. 
Step 2: Evaluating the Options 
- Extracte/raffinate: Correct, as partition coefficient is the ratio of solute concentrations between the extract and raffinate. 
- Extract/feed: Incorrect, as it does not account for the separation of the two phases. 
- Upper aqueous layer/lower aqueous layer: Incorrect, applies only to immiscible aqueous layers. 
- Amount of solute extracted / amount of solute in feed: Incorrect, as partition coefficient relates to concentration, not amounts. 
Step 3: Conclusion 
The correct definition of partition coefficient is extract/raffinate.