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 acidic solutions can be made.  By adding chemicals with OH- ions basic solutions can be made.
                                         

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 Tris

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

False, the color of the solution has nothing to do with the acidity.  It is the pH level.

 2.  Which solution is basic?
D. Both B and C are basic solutions because their pH levels are above 7.

      

 3.  Which solution is acidic?
 The answer is C because it contains mostly Hydronium which makes it acidic.  
         
 4.   Which solution is basic?
 B because it has more hydroxide ions than Hydronium.      
        
 5.  Which solution is more acidic?
 The correct answer is D both A and B are more acidic because of the levels of Hydronium.
            
 6.  How will adding water effect the pH?
 A.  Since the pH is lower than 7 more water would increase the pH    
     
 7.  How will equal amount of water effect the pH?
 B.  More water would decrease the pH since the pH is currently above 7
        
 8.  What is the order from most acidic to most basic?
 The correct answer is A based in the pH levels.      
   
 9.  What is the order from most acidic to most basic?
 The correct answer is C      

10.  If spit has a pH = 7.4, what does that tell you about the water equilibrium?
 The answer is A, since the pH is more than 7 something had to be added to shift to the basic side of the equilibrium.        

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.