Determination of Ka of a Weak Acid Report.docx - Dinn 1...

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Dinn 1 Determination of Ka of a Weak Acid October 22, 2020 Kirsten Dinn Introduction While strong acids completely dissociate in dilute aqueous solutions, weak acids only partially dissociate and are broken down in the solution to be composed of the molecular acid, the anion of the acid molecule, and hydronium ions. K a, the magnitude of the equilibrium constant is determined in a lab setting by observing the pH while a titration is taking place of a weak acid. A point in the titration will be reached when the number of moles of the base added is equal to ½ the number of moles of acid that were first present- this is called the half-equivalence point of a titration. When the titration is completed to the end, the pH at the half-equivalence point is equal to pK a which is equal to K a of the weak acid. The purpose of this lab is to determine K a of an unknown weak acid through titration with a pH meter and taking that information and interpreting it from a titration curve.

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