Activity Seven: Acids and Bases

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 solution does not always determine if it's an acid or a base.  When I changed the amount of acid to base ration on the PH scale test, the color stayed the same. Therefore securing the idea that the color of the solution does not determine if it is an acid, base, or neutral solution.

2. Which solution is basic?

D. More than one of the pictures are a basic solution.  The pH is greater than 7

in more than one solution so the solutions are basic.

3. Which solution is acidic?

C.  The color red is acid. The hydrogen is much higher therefore being acidic.

4. Which solution is basic?

B.  The lower concentration of hydrogen just confirms this. Also it can not

be answer A because it is showing equal amount of acid to base.

5. Which solution is acidic?

D.  Option A is showing molecules of coffee. Option B is showing soda,

and C is showing 13.  Everyone knows that coffee and soda have a lot of acid in them.

6. How will adding water affect the pH?

A. Increases the PH. 

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

B.  The pH decreases when water is added, 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.

 

 

 

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.