As in the previous examples, we can approach the solution by the following steps: 1. Perhaps an edit to the post in question and a comment explaining it? The strengths of oxyacids also increase as the electronegativity of the central element increases [H2SeO4 < H2SO4]. Why do diacidic and triacidic alkalis dissociate in one step? In this reaction, a proton is transferred from one of the aluminum-bound H2O molecules to a hydroxide ion in solution. The ionization constants increase as the strengths of the acids increase. Find the Ka value of carbonic acid when it dissociates in water. Is going to give us a pKa value of 9.25 when we round. Use the \(K_b\) for the nitrite ion, \(\ce{NO2-}\), to calculate the \(K_a\) for its conjugate acid. The table shows initial concentrations (concentrations before the acid ionizes), changes in concentration, and equilibrium concentrations follows (the data given in the problem appear in color): 2. Calculate the pH of a 0.409 M aqueous solution of nitrous acid. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. My book says that sulfuric acid, $\ce{H2SO4}$, dissociates in its ions following this reaction: $$\ce{H2SO4 -> H2^+ + SO4^{2-}}$$, My question is, why can't the dissociation reaction happen like this: The conjugate acid of \(\ce{NO2-}\) is HNO2; Ka for HNO2 can be calculated using the relationship: \[K_\ce{a}K_\ce{b}=1.010^{14}=K_\ce{w} \nonumber \], \[\begin{align*} K_\ce{a} &=\dfrac{K_\ce{w}}{K_\ce{b}} \\[4pt] &=\dfrac{1.010^{14}}{2.1710^{11}} \\[4pt] &=4.610^{4} \end{align*} \nonumber \], This answer can be verified by finding the Ka for HNO2 in Table E1. Legal. How much nitrous acid was used to prepare one liter of this solution? ), { "16.01:_Acids_and_Bases_-_A_Brief_Review" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "16.02:_BrnstedLowry_Acids_and_Bases" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "16.03:_The_Autoionization_of_Water" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "16.04:_The_pH_Scale" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "16.05:_Strong_Acids_and_Bases" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "16.06:_Weak_Acids" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "16.07:_Weak_Bases" : "property get [Map 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