Making and investigating buffer solutions
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... ilution, for this I shall measure out 2cm3 of buffer solution and add to it 198cm3 of distilled water. I shall then test these dilutions for their effect on the buffering capacity of my buffer solution. I shall use a pipette to measure out exactly 25cm3 of each dilute buffer solution and place it in a small beaker. I shall then repeat this so that I will have four small beakers each containing 25cm3 of a dilute buffer solution. For each dilute buffer, to one beaker I shall add HCl, to the other NaOH from two separate burettes. Initially, I shall add one drop, then 1cm3 and then 5cm3 measuring the pH after each step and recording it in a table. Results
Vol. added (cm3)
HCl (undiluted buffer)
NaOH (undiluted buffer)
HCl (1/10 diluted buffer)
NaOH (1/10 diluted buffer)
HCl (1/100 diluted buffer)
NaOH (1/100 diluted buffer)
0
9.0
9.0
9.0
9.0
9.0
9.0
0.1
8.9
9.0
8.8
9.2
7.8
10.3
1.0
8.7
9.2
8.5
9.7
2.0
11.6
5.0
8.2
9.9
2.0
11.7
1.6
12.2 Conclusion
As expected, the introduction of a small amount of strong acid or ...
