Determination of the Ionization Constant of a Weak Acid -...

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Determination of the Ionization Constant of a Weak AcidIntroductionA weak acid may be defined as one whose equilibrium favors the undissociated acid.Forinstance, in the case of HNO2only a few percent of the molecules have dissociated into H3O+andNO2-ions.The acid dissociation expression for this system is represented by][]][[223HNONOOHKa(1)We can determine the value of Kafor such a system in a number of ways.One of the most directapproaches is to simultaneously determine the molar concentration of H3O+, NO2-, and HNO2andthen solve for Ka.Another method determines Kafrom a plot of appropriate data.The acid dissociation constant for a weak acid can be determined as follows.A series ofsolutions will be prepared by mixing various volumes of a solution of weak acid with volumes ofa solution containing the sodium salt of the acid (conjugate base).Since the sodium saltcompletely dissociates, the anion concentration and undissociated acid concentration are easily

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Chemistry: The Molecular Science
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Term
Spring
Professor
KeithB.Rider
Tags
Chemistry, Equilibrium, Mole, pH, 0 10 M, 5 0 mL, 50 ml, Aadded
We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
Chemistry: The Molecular Science
The document you are viewing contains questions related to this textbook.
Chapter 15 / Exercise 97
Chemistry: The Molecular Science
Moore/Stanitski
Expert Verified

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