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Water, pH and Macromolecules

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

methane
argon
gasoline (heptanes & octanes)
sodium chloride

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Water, pH and Macromolecules
The pH of a solution is determined by

environmental effect
relative concentration of acids and bases
concentration of salt
dielectric constant of the medium

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

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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
only in combination with polyprotic bases
if their concentration is kept low

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

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

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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?

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

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