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Water, pH and Macromolecules

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

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

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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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Water, pH and Macromolecules
What is the concentration, in moles/liter, of the hydrogen ion, if pH of a solution is 7?

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

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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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Water, pH and Macromolecules
The elements oxygen, nitrogen, and carbon

contain protons and neutrons in their atomic nuclei
are common elements in the molecules that make up living organisms
All of these
can all form covalent bonds with other elements

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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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