At the midpoint of a titration curve Question 8 options: the pH equals the pKa the ability of the solution to buffer is best the concentration of a conjugate base is equal to the concentration of a conjugate acid All of the above A and B only
Question
At the midpoint of a titration curve Question 8 options:
the pH equals the pKa
the ability of the solution to buffer is best
the concentration of a conjugate base is equal to the concentration of a conjugate acid
All of the above
A and B only
Solution
All of the above
At the midpoint of a titration curve, all three statements are true:
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The pH equals the pKa: At the midpoint of a titration, half of the acid has been neutralized by the base, or half of the base has been neutralized by the acid. This is the point at which the pH of the solution equals the pKa of the acid.
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The ability of the solution to buffer is best: A buffer is most effective when the amounts of the weak acid and its conjugate base are equal. This occurs at the midpoint of the titration, where the solution can best resist changes in pH.
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The concentration of a conjugate base is equal to the concentration of a conjugate acid: At the midpoint of a titration, the moles of the acid equal the moles of the base, meaning the concentration of the conjugate base is equal to the concentration of the conjugate acid.
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