Transcription of Solutions for the problems about „Calculation of …
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Solutions for the problems about „Calculation of …
Solutions for the problems about Calculation of pH in the case of monoprotic acids and bases 1. What is the pH of a M acetic acid solution? Acetic acid is a weak acid with Ka = 10 5 and in this case cweak acid >>> Ka, that is the equation to use is: [H+] =acidweak ac K= ) (5 = M pH = -log[H+] = -log( ) = 2. What is the pH of a M ammonia solution? Ammonia is a weak base with Kb = 10 5 and in this case cweak base >>> Kb, that is the equation to use is: [OH ] =baseweak bc K= ) (5 = M pOH = -log[OH-] = -log( ) = pH = pH = = 3. What is the pH of a M sodium acetate solution? Sodium acetate is a weak base, a conjugate base of acetic acid, so: acetatebacidaceticaKK = KW that is acidaceticaWacetatebKKK == = 10-10In this case cweak base >>> Kb, that is the equation to use is: [OH ] =baseweak bc K= ) (10 = 10-6 M pOH = -log[OH-] = -log( 10-6) = pH = pH = = 4. What is the concentration (in g/dm3 units) of an ammonia solution which has a pH of Ammonia is a weak base with Kb = 10 5.
Solutions for the problems about „Calculation of pH in the case of monoprotic acids and bases” 1. What is the pH of a 0.1 M acetic acid solution?
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