What happens if the pH starts shifting either higher or lower?

Acids, Bases, and pH questions from Bozeman Science Video lecture.  Open the video in one screen and this document in another screen.  As you watch the video, you can pause it to put an answer into the document.

1.  This shows myoglobin with optimum activity at a pH of 6.  Where is this protein found and why is this important?

2.  What happens if the pH starts shifting either higher or lower?

3.  To talk about pH, what molecule do you need to talk about first?

4. What bond exists between the H and the O and the other H and the O?

5.  Oxygen has what sort of relationship with electrons?

6.  So what does that mean when we say O is pulling the electrons towards it?

7.  That results in what sort of a charge on the O side of the molecule and what sort of charge on the H side of the molecule?

8.  This results in what sort of a bond between two different water molecules and how do the two molecules face each other?

9.  How does this explain cohesion?

10.  What else happens as a result of this ‘strong’ attraction between two water molecules?

11.  What do you call the two resulting ions and what sort of a charge does each of them have?

12.  What does pH stand for?

13.  What is the chance of having hydronium in distilled water?

14.  What does it mean when we say the pH is 7?

15.  If we vary the concentration of H, we vary the pH.  That results in solutions that fall into what two ranges?

16.  What happens if we add hydrochloric acid to water?

17.  What does that do to the concentration of hydrogen atoms and how does that effect the resulting pH?

18.  What happens when we a base like sodium hydroxide (lye) to water?

19.  How is that going to effect the pH?

20.  Where do you find acids and bases on the pH scale?

21.  The thumb up represents what and the thumb down represents what?

22.  How are our oceans becoming acidified?

23. pH scale is a log scale.  What does that mean? (Hint: a shift of one pH number, such as pH4 to pH3, is a shift of 10x.  So a shift of pH5 to pH3 is a shift of 10×10= 100…which since the pH is dropping, it means pH3 is 100 times more acidic than pH5)

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