Features in the molecular structure of a compound that affect solubility mp,bp.

In summary, the molecular structure of a compound plays a significant role in its solubility, melting point, and boiling point. The strength of intermolecular forces and the size of the compound are key factors in determining these properties. Additionally, compounds with similar intermolecular forces tend to dissolve in each other due to attractive forces between molecules. Examples such as ethanol and water demonstrate this principle.
  • #1
aisha
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Hi guys, I need some help with this question. What features in the molecular structure of a compound affect its solubility and its melting and boiling points. I need to answer this question with several examples and include structural diagrams. Please help
 
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https://www.physicsforums.com/showthread.php?t=94384
 
  • #3
melting and boiling points:
the stronger the intermolecular forces, th ehigher th emelting points, and boiling points. because more energy is required to separate the molecules from one another which results in the phase changes.
the size of a compound also affects the melting points and boiling points because intermolecular forces are additive, the more bonds present in a structure the more intermolecular forces forces are present.
solubility:
like dissolves like so compounds that contain same type of intermolecular forces will dissolve in one another because two molecules will be attracted to one anothr in the same manner as two molecules of the same substance
ie: ethanol is very soluble in water because both contain O-H bonds that are attracted to one another.
 

Related to Features in the molecular structure of a compound that affect solubility mp,bp.

What is the molecular structure of a compound?

The molecular structure of a compound refers to the arrangement of atoms and bonds within the molecule. It determines the physical and chemical properties of the compound, including its solubility.

How do features in the molecular structure affect solubility?

Features in the molecular structure, such as the presence of polar or nonpolar groups, can affect the interactions between the compound and the solvent molecules, thereby affecting its solubility. For example, polar compounds tend to be more soluble in polar solvents, while nonpolar compounds are more soluble in nonpolar solvents.

What are some specific features in the molecular structure that can affect solubility?

Some features that can affect solubility include the presence of functional groups, such as hydroxyl (-OH) or carboxyl (-COOH) groups, as well as the size and shape of the molecule. The presence of double or triple bonds can also have an impact on solubility.

How do melting and boiling points relate to solubility?

The melting point (mp) and boiling point (bp) of a compound are also influenced by its molecular structure. Generally, compounds with stronger intermolecular forces, such as hydrogen bonding, tend to have higher melting and boiling points, and may also have higher solubility due to stronger interactions with the solvent.

Can the molecular structure of a compound be modified to improve its solubility?

Yes, the molecular structure of a compound can be modified through chemical reactions or synthesis to improve its solubility. For example, adding functional groups or altering the size and shape of the molecule can change its interactions with the solvent, thereby increasing its solubility.

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