Chp7_MakeBuffers

Chp7_MakeBuffers - Making Buffer Solutions A buffer...

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Making Buffer Solutions A buffer solution is composed of a weak acid (HA) and its conjugate base (A-): note that these are generic terms and relative signs as the acid might be HSO4^1– and the base SO4^2–. In any event, there are two principle means of making such solutions. The pH of a buffer solution is approximated by the Henderson-Hasselbach equation: + = a b a n n pK pH log I. Simple mixing. In this case, we simply prepare a solution containing the requisite ratio of n_b to n_a to produce the desired pH . The problem then becomes one of stoichiometry insofar as we are required to relate the number of moles to (a) masses of a solid (usually a salt of the acid and/or base) or to (b) a volume of a solution containing the acid or base. Problems 2-4 of WA Q13 are of this type as was the example we worked in class on Tuesday. II. Another means by which to produce a buffer solution is to convert a solution of the weak acid (base) to a buffer solution by using a strong base (acid) to
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Chp7_MakeBuffers - Making Buffer Solutions A buffer...

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