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Chapter 11: Q33P (page 260)
Finding the End Point with a pH Electrode
What is a Gran plot used for?
The gran plot used to locate the end point of the titration by using the data right before the equivalence point
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When 100.00mL of a weak acid were titrated with 0.09381 M NaOH,27.63 mL were required to reach the equivalence point. The at the equivalence point was 10.99 . What was the when only 19.47mL of NaOH had been added?a
Derive the following equation for the titration of potassium hydrogen phthalate (K+HP-) with NaOH:
Calculate the pH at 10.0-mL intervals (from 0 to 100 mL) in the titration of 40.0 mL of 0.100 M piperazine with 0.100 M HCl. Make a graph of pH versus Va.
Prepare a second derivative graph to find the end point from the following titration data.
Indicator error. Consider the titration in Figure 11-2 in which the equivalence-point pH in Table 11-2 is 9.25 at a volume of 10.00 mL.
(a) Suppose you used the yellow-to-blue transition of thymol blue indicator to find the end point. According to Table 11-3, the last trace of green disappears near pH 9.6. What volume of base is required to reach pH 9.6? The difference between this volume an 10 mL is the indicator error.
(b) If you used cresol red, with a color change at pH 8.8, what would be the indicator error?
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