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