CK-12 Physical Science - For Middle School

10.2. Solubility and Concentration http://www.ck12.org

FIGURE 10.3

Temperature affects the solubility of a

solute. However, it affects the solubility

of gases differently than the solubility of

solids and liquids.

Do you wonder why temperature and pressure affect solubility in these ways? If so, watch the video at the URL
below. It explains why.

http://www.youtube.com/watch?v=IKimraU21ws

FIGURE 10.4

Soda fizzes when carbon dioxide comes out of solution. Which do you

think will fizz more, warm soda or cold soda?

Concentration

The concentration of a solution is the amount of solute in a given amount of solution. A solution with little dissolved
solute has a low concentration. It is called a dilute solution. A solution with a lot of dissolved solute has a high
concentration. It is called a concentrated solution. Concentration is often expressed as a percent. You can calculate
the concentration of a solution using this formula:

Concentration=

Mass (or Volume) of Solute

Mass (or Volume) of Solution

×100%

For example, if a 100 g solution of salt water contains 3 g of salt, then its concentration is: