Hydrophilic substances become hydrated.
- Hydrophilic substances are those that can enter into a charged interaction
with water molecules.
- In the picture the positive Na ion interacts with the partial negative
region of the water molecule.
- The negatively charged Cl ion interacs with the partially positive part
of the water molecule.
- In forming these charged interaction, hydophilic substances enter into
the network formed by the water molecules.
Free water and bound water.
- The above figure also shows that when a hydrophilic substances dissolves
in water two kinds of water molecules are found.
- Free water. One kind of water molecule is hydrogen bond
to only other waster molecules. This is seen in the top left of the picture.
This kind of water molecule is called a free water molecule.
- Bound water. The other kind of water molecule interacts
with the substances that is dissolved. In the above figure these water
molecules would be interacting with the Na ions or the Cl ions. These water
molecules are called bound water molecules.
- The concentrations of free and bound water molecules are very important
in the process of osmosis.
- Lecture Outline
- Laboratory Outline
- Required Text Book