In unit 2 we learned that solutions are
homogeneous mixtures (section
2.4.2) of two or more substances. For review, take a look at the classification
scheme of matter. The substance present in the lesser amount is called the
solute. The substance present in the greater
amount is called the solvent. A common solvent
that isused is water. However, there are other
solvents such as acetone, hexane, methanol that are commonly used as cleaners
and to dissolve grease.
Solutions are not only limited to liquid solutions. For example:
air is a gaseous solution of oxygen, argon,
carbon dioxide, and water vapor in nitrogen gas.
10K gold is a solid solution of silver,copper
and zinc in gold.
carbonated soft drinks is a liquid solution of
carbon dioxide gas, sugar in water.
vinegar is a liquid solution of vinegar in
In this course, we will focus on aqueous solutions, those which
are prepared with water as a solvent.