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E N D Presentation Transcript Acid Dissociation Constant, Ka • Ka, is a measure of how readily H+ ions are released HA(aq)+ H2O(aq)H3O+(aq)+ A-(aq) Ka = [H+][A-] [HA] Ka Values • Stronger acids – higher Ka values • Weak acids – lower Ka values pKa • Since Ka values for weak acids are very small it is convenient to use the pKa scale where: pKa = -log10 Ka If Ka = 1.70 x 10-5 mol dm-3 Then pKa = -log10(1.70 x 10-5 ) pKa = 4.77 Ka Values & pKa Values • Explain the trend in strength of these acids • Calculate the pKa values of these acids pKa Values • Stronger acids – higher Ka values • Stronger acids – lower pKa values Calculate the pH of a 0.1M solution of a weak acid given that it has a pKa value of 4.76 at 298K

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