Question

Table 2: Indicator, pH Range, and Color Change

Beaker	Indicator	Amount Needed for Reaction to Complete	pH Range	pH at Color Change	Color (Initial:Final)
1	Bromothymol Blue	6	6.0-7.5	6.6	Blue > Light Yellow
2	Turmeric Indicator	6	7.5-8.8	5.3	Light Red > Yellow
3	Methyl Orange	20	2.3-4.6	7.9	Orange > Pink

Table 3: Titration Data

Part 2: mL Citric Acid Added	Part 2: pH	Part 3: mL Citric Acid Added	Part 3: pH	Part 3: Color
0.0	10.5	0.0	10.5	Orange
0.5	10.4	0.5	10.1	Orange
1.0	9.9	1.0	9.6	Orange
1.5	9.4	1.5	8.9	Orange
2.0	8.8	2.0	8.4	Orange
2.5	8.3	2.5	7.7	Orange
3.0	7.6	3.0	7.0	Orange
3.5	6.8	3.5	6.3	Orange
4.0	5.5	4.0	5.4	Orange-Pink
4.5	5.0	4.5	4.6	Orange-Pink
5.0	4.0	5.0	3.9	Orange-Pink
5.5	3.6	5.5	3.2	Pink
Total mL Added:	5.5	Total mL Added:	5.5

1. Create a graph of the titration curve of 20 mL sudsy ammonia with 0.5 M citric acid.
2. What is the pH of the solution at the equivalence point shown by the titration curve?
3. Which indicator shows a color change at about the same pH as the equivalence point?
4. Fill in the following data:
   1. Initial color of the solution:
   2. Amount of citric acid needed to reach the end point:
   3. Color of solution after endpoint was reached:
5. Identify two reasons why you did not choose the other two indicators to be used in the titration? explain.