Unit 2 - SolutionsMr. ChapmanChemistry 30

What is a solution?A solution is a mixture or a combination of two or more

things.

A solution is also known as a homogeneous mixture, because both components appear to be the same throughout the mixture.

Can you think of examples of homogeneous mixtures?

Homo vs. Heterogeneous MixturesHomogeneous Mixtures

Heterogeneous Mixtures

The parts of the mixture are not distinguishable, and the solute is completely dissolved in the solvent.

In a heterogeneous mixture, the parts of the mixture are clearly distinguishable, and in general can be easily separated.

Milk is an example of a homogeneous mixturePizza is an example of a heterogeneous mixture

DissolvingDissolve – we say something is dissolved when it is

caused to go into a solution. We always say that the solute is being dissolved in the solvent.

Watch the following video of how salt is dissolved in the solvent, water, to form a solution:

http://www.mhhe.com/physsci/chemistry/essentialchemistry/flash/molvie1.swf

Some Important Definitions...Solution – is the solute and the solvent together

Solute – the dissolved matter in a solution

Solvent – something that dissolves another substance. Water is a very common solvent.

Solubility – the ability to dissolve. We use the term “insoluble” if something does not dissolve.

MiscibilityMiscible – two liquids that are able to dissolve to form a

homogeneous solution.

Immiscible – two liquids that are not able to dissolve together.

Oil and Water are immiscible – they do NOT mix together to form a solution.

Key Point!The solubility of a substance depends on whether

or not the solute is attracted to the solvent.