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Interpretation:
The pKa value for given acid has to be calculated using pH measured at half way point in the titration. The pH for solution at given concentration has to be identified.
Concept Introduction:
pH: The concentration of hydrogen ion is measured using pH scale. The pH of a solution is a figure that expresses the acidity or the alkalinity of a given solution.
It is defined as the negative base-10 logarithm of the hydrogen or hydronium ion concentration.
pH = -log[H3O+]
If the value of pH is less than 7, then the solution is acidic whereas if the value of pH is greater than 7, then the solution is basic.
Acid dissociation constant Ka represents how strong the acid is in a solution.
pKa = − log Ka
The strength of acid decreases as the value of pKa increases.
Henderson-Hasselbalch equation:
pKa = pH + log [HA][A-]
Henderson-Hasselbalch equation explains the relationship between pH of solution and pKa of acid. For a dissociation of acid (HA) in aqueous solution,
HA + H2O ⇌ H3O+ + A−
pKa = pH + log[HA][A−]
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Chapter 5 Solutions
Elements Of Physical Chemistry
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