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experiment4 - Results and Discussions A buffer solution is...

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Results and Discussions: A buffer solution is composed of a mixture of a weak acid and its conjugate base or a weak base and its conjugate acid. A buffer with the pH of 6.7 and an approximate volume of 400 mL was prepared. The buffer had the capacity to absorb 20 mL of either .02 M HCl or .02 M NaOH and undergo a pH change of no more than ± .1. There were two parts to this lab: In the first part, we prepared our own buffer solution following the requirements listed above. In the second part, we tested another’s buffer solution, ensuring that they followed the requirements in the preparation of their own buffer. Part 1: A: Preparing Our Buffer Solution. Based on the following calculations, we figured out how much of the acid portion we should add to the base portion of our buffer. We were assigned a pH of 6.7. 1) “Derivation” of the equation we used: HA (aq) + H 2 O (l) H 3 0 + (aq) + A - (aq) Initial conc. (M) [HA] 0 [A - ] Conc. Change (M) -x Equilibrium conc. (M) [HA] -x [A - ] K a , x = H 3 0 + , therefore, [H 3 0 + ] =K a take negative log of both sides
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