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# Acid-Base Indicators

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## Acid-Base Indicators Answer Key

Instructions: The following questions require the use of a table that lists the pH ranges of common acid-base indicators.

1.
Which statement correctly describes a solution with a pH value of 10?
1. It would turn litmus red.
2. It would turn methyl orange red.
3. It would turn thymol blue yellow.
4. It would turn phenolphthalein pink.

2.
Which of the following indicators would be most useful to distinguish between soda, which has a pH of 2, and a sample of acid rain, which has a pH of 5?
1. bromthymol blue
2. methyl orange
3. litmus
4. phenolphthalein
3.
At what pH value would methyl orange and thymol blue both turn yellow?
1. 3.0
2. 9.0
3. 6.3
4. 4.0

4.
If a solution were to turn litmus blue, which of the following substances would most likely be present in this solution?
1. $NaOH$
2. $H_2 O$
3. $HN O_3$
4. $HCl$
5.
A lake has a pH of 3.0, where the rates of mortality for adult fish are steadily increasing over time. How would a sample of water from this lake affect bromthymol blue?
1. It would turn the indicator blue.
2. It would turn the indicator red.
3. It would turn the indicator yellow.
4. It would turn the indicator pink.

6.
What is the color of methyl orange for a sample of potassium hydroxide, KOH?
1. It is red.
2. It is orange.
3. It is yellow.
4. It cannot be determined, based on the information given.
7.
Which of the following solutions would most likely turn bromcresol green yellow?
1. $CH_3 OH$
2. NaOH
3. $CH_3 COOH$
4. $H_2$

8.
Which of the following indicators would be most useful in distinguishing between a solution with a pH of 4.0 and a solution with a pH of 8.5?
1. methyl orange
2. bromthymol blue
3. thymol blue
4. litmus
9.
The mouth has a pH in the range of 6-7. If a sample of saliva were to be taken from the mouth, how would it affect the color of bromcresol green?
• Award credit for the following answer:
• It would turn bromcresol green blue.

10.
Phenolphthalein helps to provide the end point of a titration with a reasonable amount of accuracy.
1. True
2. False
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