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Water, pH and Macromolecules

Water, pH and Macromolecules
Which of the following will easily dissolve in a polar solvent?

sodium chloride
argon
methane
gasoline (heptanes & octanes)

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Water, pH and Macromolecules
The dissociation constant of H2O at 25° C is

10-7 M
10-14 M
1014 M
107 M

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Water, pH and Macromolecules
Weak acids generally have pKa

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

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

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

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Water, pH and Macromolecules
Which of the following organic groups are found in naturally occuring amino acids?

All of these
Imidazole
Indole
Guanidinium ion

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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?

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

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