Activity 7: Acids and Bases

1. 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.

(A red solution could be both blood or vomit...these have totally different pH levels)

(Two are greater than 7)

(Contains mostly H30)

(Contains mostly OH)

(More than one contains mostly H30)

(Brings it closer to neutral)

(Brings it closer to neutral)

(A has the lowest pH, B has the middle, and C has the highest)

(C has the most H30, A the middle, B the lowest)

(Explanation from slides: Since the pH is not 7, then something was added to make the equilibrium shift left.  For example, if NaOH was added to water, OH- is immediately in the solution and some of it will react with the H30+, so the pH goes up.  If something like HCl were added there would be more H30+, which would also cause a shift left, but there would be less OH-, so the pH is less than 7)

2. 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.