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Water, pH and Macromolecules

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

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

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Water, pH and Macromolecules
Weak acids generally have pKa

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

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Water, pH and Macromolecules
H2O and CH4 are both examples of

molecules
none of these
acids
ions

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Water, pH and Macromolecules
The lone pair electrons on oxygen in a H20 molecule

form covalent bonds in ice
carry a partial positive charge
are not important for the properties of water
carry a partial negative charge

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

gasoline (heptanes & octanes)
sodium chloride
argon
methane

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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 neutrality
at pH values around any of their pKa's

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