DISCUSSION• In every experiment with calculations, we should have precise and accurate data and values to be able to get a correct and successful results. In this experiment, we need to have the correct values for the volume, molarity of the solution to have the exact preparation of the solution and the buffers- both the phosphate and acetate buffer.• In the experiment, we focus on the effect of buffer solution. In which buffer is said to be a combination of weak acid or weak base and its salt.• The 1st solution, which has the distilled water will be the reference solution since water has the neutral pH of 7.00. Using pH meter, the pH is 7.22 and 7.00 using the pH paper.
DISCUSSION• The second solution was added with a drop of HCl and as expected the pH of the solution dropped since HCl is known to be a strong acid. The pH meter result is 3.20 and 3.00 in pH paper.• The third solution which contains the 10 ml phosphate buffer (5 ml KH2PO4 and 5 ml K2HPO4 ), we obtain a pH of 7.47 using pH meter and 7.00 using pH paper. We then add 1 drop of HCl in the solution and as expected, the pH drops into 7.43 using the pH meter and 7.00 using the pH paper. This shows that the phosphate buffer is effective since it resist a large change in the pH value and in fact, it is still in the pH range from the theoretical pH which is 7.14. next
14. DISCUSSION• The fourth solution has the 10 ml acetate buffer (CH3COOH and CH3COOHNa+ ), we obtain a pH of 5.98 using pH meter and 6.00 using pH paper. We then add 1 drop of HCl in the solution and as expected, the pH drops into 5.96 using the pH meter and 5.00 using the pH paper. It shows that the obtained pH is near to the theoretical pH of 4.74 since the maximum pH of it is 5.74 . Hence it is computed by adding or subtracting 1 to the final pH value.• Based on all the results gathered, it shows that it has a small difference from the obtain or experimental value to the theoretical value. Thus, it shows a good result. One factor that can affect the result obtain is the instrumental error since the pH meter available and use in the experiment is defective.• The Henderson-Hassellbach equation also gave a big factor in our computation without the knowledge about this, it is very hard for us to compute and even analyze the resulting pH of a given buffer.