Relationship between solubility and intermolecular force

How do intermolecular forces affect solubility? | Socratic

relationship between solubility and intermolecular force

This energy is required to break up the intermolecular forces which "A hydrogen bond is a link formed by a (slightly positive) hydrogen atom lying between two . A knowledge of IMF's can help us understand the solubility of. The strength of the intermolecular forces between solutes and solvents Qualitatively, one can determine the solubility of a solute in a solvent by using the rule .. From this relationship, we can clearly see that the processes of overcoming the. Intermolecular forces are attractive forces between molecules. They are largely responsible for the observed boiling points and solubility properties of molecules.

The liquid that dissolves the solute is called the solvent. Of course we can have solution of solids like saltliquids like ethanol and gases like carbon dioxide - all solutes - dissolved in the liquid solvent.

Likewise the air is a solution of gas solutes in a gas solvent. Some substance can dissolve in water, others can't. Substances that can't dissolve in water often dissolve in other solvents. Some solid substances dissolve in a solvent like water to different extents. When no more solute can be added to a solvent, we say the solution is saturated with the solute.

Any additional solid added will remain as a solid in the solution.

How do intermolecular forces affect solubility?

A liquid solute may not dissolve in water. In this case, it will form a discrete layer either above or below the water layer depending on its density. Such a liquid is immiscible in the solvent. Some liquid solvents dissolve in any proportion in water. Such a liquid solute is completely miscible. Solubilty of molecules in water and hexane A knowledge of IMF's can help us understand the solubility of different substances solutes in different liquids solvents.

What is the relationship between solubility and intermolecular forces? | Yahoo Answers

In class I did a series of demonstrations which showed if different solutes were soluble in two different solvents, water and hexane, whose structures are shown below. A quick inspection of these solvents show them to be quite different. In contrast, water, a clear, colorless liquid at room temperature, is polar and interacts with other water molecules through H-bonds.

You might expect they might dissolve different types of solutes. Explore the solubility differences of the different solutes below in hexane and water.

Solubility and intermolecular forces (video) | Khan Academy

Develop a law that will allow you to predict the solubility of a substance in water or hexane, and then develop an hypothesis that helps explain the law. NaCl - sodium chloride: NaCl is a salt held together by ionic bonds.

In a sense it is as polar a substance as you can get.

relationship between solubility and intermolecular force

It dissolves in water as you know from experience but not in hexane. Iodine, a covalent solid, in contrast to water, is completely nonpolar. It dissolves in hexane to produce a purple-colored solution. It didn't dissolve in water.

relationship between solubility and intermolecular force

From the above two examples, we can surmise that polar molecules dissolve in polar liquids, and non-polar molecules in nonpolar liquids.

An inspection of the molecule shows that is is predominately polar with a small nonpolar CH3 group. Our tentative law seems to work so far! It formed a separate layers in water. In this example, most of the molecule is nonpolar the long C-H tail with just a small part at the right end being polar. For elements in the periodic table, the electronegativity increases from left to right in a row, and from bottom to top in a column. So, in molecules like H2 or N2 where the atoms have exactly the same electronegativity, the bond is non-polar covalent.

The difference in electronegativity between H and C in hydrocarbons is very small and these are also considered to be non-polar bonds.

Solubility and intermolecular forces

Hydrogen and oxygen are very different in electronegativity. The bonds between H and O in water are polar covalent.

relationship between solubility and intermolecular force

When the electronegativity difference is 2 or greater, as it is in NaCl, the bonding is ionic. Polar Molecules Linear molecules, like H-F, with a polar bond are always polar molecules. We can represent this with a vector, called the dipole moment of the molecule.

  • What is the relationship between solubility and intermolecular forces?

Molecules with polar bonds are not necessary polar molecules. Take carbon tetrachloride, CCl4, as an example. Each C-Cl bond is polar with an electronegativity difference of 0. We can represent the polarity of each bond as a vector, showing electrons in the bond going closer to the more electronegative chlorine atom. The vector sum of the 4 bond vectors is zero. So this is a non-polar molecule. Replace one of the Cl atoms with an H atom.

relationship between solubility and intermolecular force

Now the vectors don't cancel and the molecule has a net dipole moment. Solutions Intermolecular Forces Water is often called the universal solvent. It dissolves polar compounds through dipole-dipole interactions. Compounds with oxygen and nitrogen groups are stabilized, and solvated, through hydrogen-bonding interactions.