Activity #7

Activity 7: Acids and Bases

Water is everywhere!  So, lets spend one more activity learning about one of the key aspects of water.  Water has the ability to dissociate (break apart from HOH (or H₂O) into H+ ions and OH- ions).  We refer to solutions with lots of H+ ions as acids and solutions with lots of OH- ions as bases.  By adding chemicals with H+ ions acidic solutions can be made.  By adding chemicals with OH- ions basic solutions can be made.


Activity Tasks:

1. Review the Content Slides Acids and Bases on the D2L site.

2. Complete the Teaching Idea “Concept Questions for Chemistry using PhET”  posted by Trish Loeblein on the pH Scale simulation at PHET (http://phet.colorado.edu/en/simulation/ph-scale). On your blog post the answers with your scientific explanations from the “Clicker Questions pH Scale” posted by Trish.


  1. The color of a solution identifies if it is an acid, base, or neutral solution.
 
 

B. False   The color of the ph will indicate if it is an acid or a base or nuetral. If it is below 7 it is a acid and if it is above 7 it is a base but if it is 7 it is netral. A base turns blue.

   

2. E. None      a base would turn blue.

3. C.  It is acidic because it is mostly red.

 

4. B.  It is basic because it is mostly blue. More than 7. 

 

5. D. More than one.  They both are below 7 on the ph scale and are acidic. 

 

6. A. Increase the pH.  The more water you add the less acidic it becomes.

 

7. B. Decrease the pH.    More water brings it closer to nutral so the pH goes down.  

8. A. ABC  The more acidic the closer to 0 and the more basic the closer to 14 it will be. 

 

9. C. BAC  Acids are closer to 0 and bases are closer to 14.

 

10. A. Something was added that made the equilibrium shift left.  

3. Complete the Teaching Idea “Intro to Strong and Weak Acids and Bases” posted by Chris Bires on the Acid-Base Solutions simulation (http://phet.colorado.edu/en/simulation/acid-base-solutions) and post on your blog your data and answers to the questions posed.