2.3.4 Dissociation of Water and the pH Scale Flashcards
1
Q
water
A
- can dissociate into hydronium (H3O+) and hydroxide ions (OH–)
2
Q
pH
A
- of a substance is a function of the proton concentration (or H3O+ concentration) of the substance. The following equation is used to determine pH: pH = -log [H+].
3
Q
acid
A
- a proton (H+) donor. Acids increase the proton concentration of a solution, lowering the pH.
4
Q
base
A
- a proton acceptor. Bases lower the proton concentration of a solution, increasing the pH.
5
Q
mole
A
- a unit in chemistry that is equal to a certain number of molecules. Just as a dozen is 12 items, a mole is 6.023 x 1023 molecules
6
Q
A base is a substance that
A
- increases the pH of a solution.
7
Q
A solution contains 1 × 10−13 moles per liter of hydrogen ions. What is the pH of this solution?
A
- pH = 13
8
Q
A solution with a pH of 9 is more __________ than a solution with a pH of 6.
A
- basic
9
Q
An acid is a substance that
A
- donates protons to a solution.
10
Q
In the presence of a strong base, a water molecule acts like a (an) _________ and becomes a ___________.
A
- acid, hydroxide ion
11
Q
When in the presence of a strong acid, a water molecule acts like a (an) ________ and becomes a __________.
A
- base, hydronium ion
12
Q
The strongest bases would have a pH of ____.
A
- 14
13
Q
If a solution has a pH of 9, then
A
- it contains 1 × 10−9 moles of hydronium per liter.
14
Q
A solution has a pH of 10. Another solution has a pH of 7. The first solution is _____ times more basic than the second.
A
- 1,000
