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Water, pH and Macromolecules

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

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

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Water, pH and Macromolecules
A compound that is capable of forming hydrogen bonds with water

does not dissolve well in water
contains at least some polar covalent bonds
is probably held together by noncovalent bonds
should act as a good buffer for acids and bases

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Water, pH and Macromolecules
A Bronsted acid becomes __________ upon losing a proton.

its conjugate base
its conjugate acid
a hydronium ion
highly reactive

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

10 times more acidic
100 times more acidic
10 times more basic
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?

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

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

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

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