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The data for the titration of 25.00 mL of Unknown Acid Sample #80 with 0.1508 M…
The data for the titration of 25.00 mL of Unknown Acid Sample #80 with 0.1508 M NaOH (aq) was plotted on the graph below.
To help with your analysis we have summarized some of the key numerical values that were determined from the original data – using the methods on Page 13 of your lab manual to graphically determine the equivalence point.
| Unknown #27 | |
| Volume of NaOH added at the potentiometric endpoint (mL) | 21.25 mL |
| Volume of NaOH added at the half-equivalence point (mL) | 10.63 mL |
| pH at the half-equivalence point | 4.90 |
| pH at the start of the titration | 3.23 |
Report your calculated original (stock) acid concentration (in mol/L) below, using the appropriate number of significant figures. Do not use scientific notation!
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