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Water, pH and Macromolecules

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

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

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Water, pH and Macromolecules
If protein is made exclusively from nonpolar amino acids, then it will this protein interact with water?

be repelled by water
It will form a membrane in water
It will be attracted to water
It will act as a buffer and stabilize the pH

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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
5 x 10-7
7 x 10-7

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

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

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Water, pH and Macromolecules
The effectiveness or capacity of a buffer solution can be affected by

molar concentration of the buffer components
temperature of buffer components
concentration of the conjugate base to the weak acid
both (a) and (b)

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Water, pH and Macromolecules
Weak acids generally have pKa

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

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