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Water, pH and Macromolecules

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

Otto Warburg
Karl Landsteiner
Karl Hooper
Theodor Kocher

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

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

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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
at pH values around any of their pKa's
if their concentration is kept low
at pH values around neutrality

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

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

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

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

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

molecules
acids
ions
none of these

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