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Making and investigating buffer solutions
Member rating: No Rating | Words: | Submitted: Mon Feb 07 2005
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Making and investigating buffer solutions ` Aim I will attempt to prepare two buffer solutions. The first buffer solution will have a pH value of 5.2 and will be made from a mixture of 1.0M ethanoic acid and 1.0M sodium ethanoate solution. The second buffer solution will have a pH value of 8.8 and will be made from a mixture of 1.0M ammonia and 1.0M ammonium chloride solution. Plan In order to make these buffers, I will need to calculate the exact proportions of salt solution and acid/alkali to add in order to obtain the necessary pH value: pH = pKa - log [HA] [A-] Given that: The pKa value for 1.0M ammonia and 1.0M ammonium chloride solution is 9.3. The pKa value for 1.0M ethanoic acid and 1.0M sodium ethanoate solution is 4.8. For the making of the buffer pH 5.2: Equations for the dissociation of ethanoic acid and sodium ethanoate respectively: CH3COOH + H2O - CH3COO- + H3+O CH3COONa › CH3COO- +...
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