Discussion
What is the descriptive term for a solute that requires less than 1 part of solvent for 1 part of solute ?
Answer: A
A solute needing less than 1 part of solvent for 1 part of solute is very soluble.
The pharmacopoeial descriptive terms, in parts of solvent needed for 1 part of solute:
| Term | Parts of solvent |
|---|---|
| Very soluble | less than 1 |
| Freely soluble | 1 to 10 |
| Soluble | 10 to 30 |
| Sparingly soluble | 30 to 100 |
| Slightly soluble | 100 to 1,000 |
So freely soluble, soluble and slightly soluble all need at least 1 part of solvent, and progressively more.
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