Significance of pH Flashcards by Amy Dougan | Brainscape

Q

What is the pH of blood?

A

7.4

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Q

What is the pH of urine?

A

6.0

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Q

What is the pH of gastric fluid?

A

2.0

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Q

What is the pH of saliva?

A

6.7

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Q

What is the main skeletal buffer?

A

Phosphate

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Q

What is the main saliva buffer?

A

Bicarbonate

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Q

What are 2 other saliva buffers?

A

Bicarbonate
Phosphate
Ammonia
Histatins

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Q

What is the simple calculation for pH?

A

ph = - log10 [H+]

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Q

What do acids dissociate to release?

A

H+ ions

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Q

What does acid produce in water?

A

H+ ions

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Q

What do alkalines combine with in water?

A

H+ ions

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Q

What are bases described as?

A

H+ acceptors

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Q

What are acids described as?

A

H+ donors

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Q

What is the chemical formula for bicarbonate?

A

HCO3-

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Q

What does carbonic acid dissociate to produce?

A

Bicarbonate

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Q

What is Ka?

A

The acid dissociation constant

Q

The stronger the acid, what is the value of pKa?

A

Smaller the pKa (greater the Ka)

Q

If the acid is stronger and the pKa is greater, how does this affect the equilibrium?

A

It is pushed to the right - more dissociated

Q

What is the henderson hasslebach equation?

A

pH = pKa + log10 [B]/[A]

Q

What are 3 commonly produced acids by oral bacteria?

A

Formic acid
Lactic acid
Acetic acid

Q

What is an acid that is awful for the teeth?

A

Citric acid

Q

What can be used to determine pH?

A

Indicator

Q

What is the function of a buffer?

A

To resist changes in pH