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Water, pH and Macromolecules

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

Indole
Guanidinium ion
All of these
Imidazole

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Water, pH and Macromolecules
Which of the following alcohols would be most soluble in water?

octanol
butanol
ethanol
methanol

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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?

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

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Water, pH and Macromolecules
Which of the following acid/base pairs act as natural buffers in living systems?

Histidine+/histidine
H2PO4-/HPO42-
H2CO3/HCO3-
All of these

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Water, pH and Macromolecules
The strength of an acid depends on

number of protons released
number of double bonds
number of neutrons gain
electronegativity

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

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

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