Podcast
Questions and Answers
Which statement is true of pH buffers? (Select all that apply)
Which statement is true of pH buffers? (Select all that apply)
- They keep the pH of the blood constant.
- They consist of strong acids and strong bases.
- They consist of weak acids and weak bases. (correct)
- Both (a) and (b).
- Both (b) and (c). (correct)
How does this system buffer a solution against decreases in pH? (Select all that apply)
How does this system buffer a solution against decreases in pH? (Select all that apply)
- HA dissociates and releases H+ and A- into solution.
- A- reacts with H+ to become HA. (correct)
- As the solution loses H+, HA replaces the lost H+.
- Both (a) and (c). (correct)
- None of the above.
Buffers work best when ____.
Buffers work best when ____.
about half of the buffer molecules are dissociated.
How does the way a buffer stabilizes pH during addition of acid differ from the way the same buffer stabilizes pH during addition of base?
How does the way a buffer stabilizes pH during addition of acid differ from the way the same buffer stabilizes pH during addition of base?
Which answer helps to explain why all living cells need pH buffers?
Which answer helps to explain why all living cells need pH buffers?
To make a buffer, you need to:
To make a buffer, you need to:
The brackets are indicating a(n) ____ bond.
The brackets are indicating a(n) ____ bond.
What name is given to the bond between water molecules?
What name is given to the bond between water molecules?
What is the arrow pointing to?
What is the arrow pointing to?
Which one of these is an amino group?
Which one of these is an amino group?
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Study Notes
pH Buffers
- pH buffers consist of weak acids and weak bases, which help maintain stable pH levels.
- They are crucial for keeping blood pH constant.
Buffer Components
- A buffer is composed of undissociated acid (HA) and its dissociated ion (A-).
- The buffering action against pH decreases involves A- reacting with H+ to form HA.
Buffer Efficiency
- Buffers are most effective when about half of their molecules are dissociated.
Buffering Mechanisms
- Buffers stabilize pH changes through reversible reactions: adding acid or base causes the same reaction to run in reverse or forward.
Importance of Buffers in Cells
- Living cells require pH buffers because amino acid side chains contain many carboxyl and amino groups, which can affect protein structure and function.
Creating Buffers
- A buffer is created by having a weak acid or weak base that is half ionized in water.
Nature of Water Bonds
- The hydrogen bond is the interaction between water molecules and is essential for various biological processes.
Understanding Molecular Interactions
- Identifying molecules, such as recognizing hydroxide ions, hydronium ions, or hydrogen ions, is key for understanding acid-base chemistry.
Amino Groups
- Familiarity with functional groups, like amino groups, is important for studying biochemistry and molecular biology.
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