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01
14.2 Buffers
A buffer is a solution that resists a change in pH when a little acid or base is added. It works because a weak acid and its conjugate base are both present, ready to absorb what you add.
QUESTION 1Multiple choiceCorrect
Which mixture makes a buffer?
Add a strong acid and the conjugate base soaks up the extra H⁺. Add a strong base and the weak acid gives up H⁺ to neutralise it.
QUESTION 2Fill in the blankCorrect
Acetic acid has a pKₐ of , so an acetate buffer works best near pH .
Not every change in a reaction is chemical. Some only change how matter looks.
QUESTION 3MatchingCorrect
Match each change to its kind.
Iron rusting
Ice melting
Your blood is a buffer too. It holds a pH near 7.4 even after a heavy workout.
QUESTION 4Written answerSent
In one line, why does your blood need a buffer?
Your instructor sees this
Next: titration curves, and how to read the buffer region from one.
02
3/ 3
Ready for the exam
You know buffers well.
- pH after adding acid
- Making an acetate buffer
- Best pH for acetate
Practice · Buffers3 / 3
An acetate buffer works best near which pH?
Practice · Buffers2 / 3
Which pair would you mix to make an acetate buffer?
Practice · Buffers1 / 3
You add a little acid to a buffer. What does the pH do?
03
Question · Buffers
Which pair makes a buffer?
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