Experiment : Examination Of Buffers

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Experiment 2: Examination of Buffers
Purpose:
Buffers can be used to resist change in pH in an acid or base solution. The purpose of the lab is to understand the properties of buffers in relative concentrations, in the presence of a strong acid/base and dilution of buffer components the ammonia/ammonium buffer system. In this case, these laboratory techniques associated with buffers are performed to determine the pH values in diluted solutions. This is done by observing the Henderson-Hasselbalch equation. This represents the pH value by comparing the p value and the concentrations of a weak acid and conjugate base of a buffer solution, as long as assumptions are valid. From there, a pH vs log can be used from the values obtained. Then, the theoretical pH of solutions can be determined with the addition of a strong acid (HCl) and base (NaOH). From this, the effect of dilution can be viewed when plotting the calculated pH values vs dilution on the same graph.

Procedure:
CHE 135 Experiment 2, General Chemistry III Lab, Spring Quarter 2015-2016, DePaul University. [Online] htps://www.d2l.depaul.edu (April 19, 2016).
• Standard buffer solutions (7 and 10)
• Use of Ammonia and Ammonium chloride
Data and Results:
The table below shows the pH for the acid/base solutions. The pH measurement was used later when calculating the pH difference after adding a strong acid or base. These pH measurements show that all of the solutions, are all basic due to their pH level being

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