CK-12 Physical Science - For Middle School

http://www.ck12.org Chapter 10. Chemistry of Solutions

Concentration=

3 g

100 g

×100%=3%

For some problems that are more challenging, go to these URLs:

http://www.youtube.com/watch?v=RCbhk3yyM88 (4:03)

MEDIA

Click image to the left for use the URL below.

URL: http://www.ck12.org/flx/render/embeddedobject/5009

http://www.youtube.com/watch?v=dHxXtkH8ILs (3:39)

MEDIA

Click image to the left for use the URL below.

URL: http://www.ck12.org/flx/render/embeddedobject/5010

You Try It!

Problem:A 1 L container of juice drink, called brand A, contains 250 mL of juice. The rest of the drink is water.
How concentrated is brand A juice drink?

Problem:A 600 mL container of another juice drink, called brand B, contains 200 mL of juice. Which brand of
juice drink is more concentrated, brand A or brand B?

Lesson Summary

• Solubility is the amount of solute that can dissolve in a given amount of solvent at a given temperature. A
  solution that contains as much solute as can dissolve at a given temperature is saturated. A solution that
  contains less solute than can dissolve at a given temperature is unsaturated. Factors such as temperature affect
  solubility.


• The concentration of a solution is the amount of solute in a given amount of solution. A dilute solution has a
  low concentration of solute. A concentrated solution has a high concentration of solute.

Lesson Review Questions

Recall

1. Define solubility.