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Water, pH and Macromolecules

Water, pH and Macromolecules
Who discovered and described the blood groups (ABO) classification?

Otto Warburg
Karl Hooper
Karl Landsteiner
Theodor Kocher

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

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

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

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

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Water, pH and Macromolecules
Molecules in which the atoms are held together by __________ bonds have the strongest chemical linkages.

covalent
hydrogen
ionic
noncovalent

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

2 times more basic
100 times more acidic
10 times more acidic
10 times more basic

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