In statements on solubility in the section headed characters, the terms used have the following significance referred to a temperature between 15°C and 25°C.
Statements given under the side heading such as "solubility in ethanol" express exact requirements and constitute part of the standards for the substances under which they occur.
specification, weigh the quantity of the material specified in the below table and
transfer to the container.
2. Add the quantity of solvent indicated and shake well.
3. Note down the observation in the Record of analysis.
The approximate solubilities are indicated by the descriptive terms in the accompanying table.
|
|
Descriptive Term |
Parts of Solvent required for 1 part of solute |
Example |
|
|
Very Soluble |
Less than 1 |
1g of sample in less than 1mL of solvent |
|
|
Freely Soluble |
From 1 to 10 |
1g of sample in1 to 10mL of solvent |
|
|
Soluble |
From 10 to 30 |
1g of sample in 10 to 30mL of solvent |
|
|
Sparingly Soluble |
From 30 to 100 |
1g of sample in 30 to 100mL of solvent |
|
|
Slightly soluble |
From 100 to 1000 |
0.1g of sample in 10 to 100mL of solvent |
|
|
Very slightly soluble |
From 1000 to 10000 |
10 mg of sample in 10 to 100mL of solvent |
|
|
Practically insoluble, or Insoluble |
Greater than or equal to 10000 |
10 mg of sample in 100mL of solvent |
5. Miscibility of solute to be checked in all proportions with the stated solvent.
6. The term “Partly soluble” is descriptive term of mixture where only some of the
components dissolve.
Solubility, general testing procedure,
