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Water, pH and Macromolecules

Water, pH and Macromolecules
The reason that fats contain more energy than simple sugars, is fats have many more

hydrogen atoms
hydrogen bonds
covalent bonds
carbon atoms

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Water, pH and Macromolecules
Weak acids generally have pKa

pKa values greater than 2
been seldom found in living systems
values less than 1
that cannot be used to buffer

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Water, pH and Macromolecules
Which of the following indicates that the pK of an acid is numerically equal to the pH of the solution when the molar concentration of the acid and its conjugate base are equal?

Michaelis-Menten equation
Haldanes equation
Hardy-Windberg law
Henderson-Hasselbalch equation

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Water, pH and Macromolecules
Polyprotic acids such as H3PO4, can act as acid-base buffers

at pH values around neutrality
at pH values around any of their pKa's
if their concentration is kept low
only in combination with polyprotic bases

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Water, pH and Macromolecules
A solution with pH = 5 is __________ than a solution with pH = 7.

100 times more acidic
10 times more basic
10 times more acidic
2 times more basic

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Water, pH and Macromolecules
What is the concentration, in moles/liter, of the hydrogen ion, if pH of a solution is 7?

1 x 10-7
5 x 10-7
7
7 x 10-7

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