pH and Buffering Flashcards Preview

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Flashcards in pH and Buffering Deck (11)
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1
Q

How do buffers work?

A

They release H ions when the pH rises, and accept H ions when pH drops.

2
Q

What is the equation for pH?

A

pH = -log[H+]

3
Q

What is the equivalence point of a pH titration curve?

A

It is half way up the steep part of the graph and represents a point where all of the acid had dissociated into conjugate base

4
Q

What is the pH of half of the equivalence point equal to?

A

The pKa

5
Q

What is the pKa of a solution?

A

It is -log(ka) where ka is the dissociation constant

It is the point in a titration where the solution is half acid and half conjugate base

6
Q

What do the flat sections on a pH titration curve indicate?

A

Buffering

7
Q

State the Henderson hasslebach equation.

A

pH = pKa + log(cojagate base conc./acid conc.)

8
Q

What makes a good buffer?

A

A weak acid and its conjugate base

9
Q

When is a bufferer at its best?

A

Around its pKa

10
Q

What is the pKa of oxyhemoglobin?

A

6.8

11
Q

What is the pKa of deoxyhemoglobin?

A

7.8