5 A)Which of the following statements is true? The pH of pure water at room temp
ID: 206879 • Letter: 5
Question
5 A)Which of the following statements is true?
The pH of pure water at room temperature is 7.2.
Buffers are weak acids and bases that are used biologically to maintain the pH of a system.
The dissociation constant equation can be used to determine the ionization state of acids and bases in solution.
The equilibrium constant of a reaction can be used to accurately assess the state of linked reactions in cells.
5 B) Why is phosphoric acid such a biologically important molecule?
It has buffering capacity at pH 5.0, which is important for lysosomal function.
It protects nucleic acids from oxidation and other forms of damage.
It has a high degree of molecular affinity for buffers.
It contains three distinct hydrogen atoms that dissociate at different pH values and, therefore, has buffering capacity in three ranges.
Explanation / Answer
A) Option 3 : The dissociation constant equation can be used to determine the ionization state of acids and bases in solution is true.
pH of pure water at room temperature is 7, Buffer is a mixture of a weak acid and its conjugate base, or vice versa, Equilibrium constant provides information for that particular forward and backward reaction for which it is calculated.
B) Option 4 is the correct answer.
It contains three distinct hydrogen atoms that dissociate at different pH values and, therefore, has buffering capacity in three ranges. This allows phosphoric acid buffering capacity over a wide range of pH making it an important biological molecule.
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