Question

# Enter the following data into the calculator and graph pH versus mL of NaOH added. At...

Enter the following data into the calculator and graph pH versus mL of NaOH added.

At the endpoint you should see a rapid change in pH. Identify the two volumes on each side of the endpoint, and determine the color change of the indicator for the end point.

Data Analysis Table

 Volume of NaOH Solution Added pH Color 0.00 mL 2.79 Clear 1.00 mL 3.99 Magenta then clear 2.00 mL 4.49 Magenta then clear 3.00 mL 4.99 Magenta then clear 4.00 mL 5.34 Magenta then clear 5.00 mL 11.54 Magenta 6.00 mL 12.33 Magenta 7.00 mL 12.63 Magenta 8.00 mL 12.82 Magenta 9.00 mL 12.87 Magenta 10.00 mL 12.97 Magenta 11.00 mL 13.06 Magenta 12.00 mL 13.11 Magenta 13.00 mL 13.16 Magenta 14.00 mL 13.17 Magenta 15.00 mL 13.22 Magenta 16.00 mL 13.25 Magenta 17.00 mL 13.26 Magenta 18.00 mL 13.31 Magenta 19.00 mL 13.32 Magenta 20.00 mL 13.37 Magenta

Here the pH vs volume of NaOH added has been plotted. As one can see the rapid pH change occurs between volume 4 mL and 5 mL of NaOH. So the two volumes at two sides of the endpoint are 4mL and 5 mL. From the table we can see that the colour change between these two volumes is magenta to clear to permanent magenta. So the colour change for the indicator is clear to magenta.

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