Referring to solvent mixtures, which statements are TRUE ?
(Select all correct answers.)
The solvents of the solvent mixture should have very similar polarities.
The solvents of the solvent mixture should have different polarities.
The student has to pay more attention during the boiling process to avoid changes in the solvent polarity
Mixed solvents can be used to fine-tune the solubility behavior better.
Low boiling solvents like dichloromethane or diethyl ether should be part of any solvent mixture.
To determine which statements are true regarding solvent mixtures, let's analyze each statement:
1. The solvents of the solvent mixture should have very similar polarities.
This statement is partially true. Solvents with similar polarities in a solvent mixture can provide better solubility for a wider range of compounds. However, having solvents with slightly different polarities can also be beneficial as it allows for a wider range of solubility and can help dissolve different types of molecules. Therefore, this statement is not entirely accurate.
2. The solvents of the solvent mixture should have different polarities.
This statement is true. Combining solvents with different polarities can enhance the solubility behavior of the mixture. Solvents with different polarities can dissolve a broader range of solutes, facilitating the dissolution of a greater variety of compounds.
3. The student has to pay more attention during the boiling process to avoid changes in the solvent polarity.
This statement is not true. The boiling process itself does not typically induce changes in solvent polarity. The boiling point of a solvent generally remains constant unless a chemical reaction occurs. Therefore, it is not necessary to pay more attention to the boiling process in relation to changes in solvent polarity.
4. Mixed solvents can be used to fine-tune the solubility behavior better.
This statement is true. Combining different solvents in a mixture can help fine-tune the solubility behavior. By carefully selecting and blending solvents with specific properties, such as polarities, volatility, and miscibility, it is possible to create solvent mixtures that provide optimal solubility for various compounds.
5. Low boiling solvents like dichloromethane or diethyl ether should be part of any solvent mixture.
This statement is not true. While low boiling solvents like dichloromethane or diethyl ether possess useful properties, they are not mandatory components in all solvent mixtures. The choice of solvents in a mixture depends on the desired solubility behavior, the specific application, and safety considerations.
In summary, the true statements regarding solvent mixtures are:
- The solvents of the solvent mixture should have different polarities.
- Mixed solvents can be used to fine-tune the solubility behavior better.
The statements that are TRUE regarding solvent mixtures are:
1) The solvents of the solvent mixture should have different polarities.
2) Mixed solvents can be used to fine-tune the solubility behavior better.