Activity 7: Acids and Bases

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.  It doesn’t always matter what the color of the solution is, it doesn’t determine if it is an acid or a base.

2. Which solution is basic?

D. More than one.  The pH is greater than 7 in more than one solution so the solutions are basic.

3. Which solution is acidic?

C.  The Hydrogen concentration is much higher, making it acidic.

4. Which solution is basic?

B.  This has a lower concentration of Hydrogen.

5. Which solution is acidic?

D.  Both solutions A and B have higher levels of Hydrogen.

6. How will adding water affect the pH?

A. Increase the pH.  By adding the water to the solution it will become more diluted and the acidity goes down, increasing the pH level.

7. How will equal amount of water effect the pH?

B.  The pH decreases when water is added which lessens the basicity, causing the pH to go down.

8. What is the order from most acidic to most basic?

           A. A, B, C.

9. What is the order from most acidic to most basic?

           C. B, A, C.

10. If spit has a pH = 7.4, what does that tell you about the water equilibrium?

          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.