The objective of this lab is to determine and compare the buffering capacities of several solutions.
For the first part of the experiment, you will prepare solutions with various pH values by combining different ratios of potassium hydrogen phosphate and potassium dihydrogen phosphate solutions. For each solution, you will measure the initial pH and then, after adding either acid or base, you will measure the new pH. The buffer capacity for the solution can be calculated by dividing the moles of H+ (or OH-) added by the resulting change in pH.
In the second part of the lab, you will evaluate the buffering capacity of solutions containing the over-the-counter pain relievers aspirin and Bufferin solutions.