Acid-Base Indicators (Grade 10)
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Acid-Base Indicators
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?
- It would turn litmus red
- It would turn methyl orange red
- It would turn thymol blue yellow
- 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?
- bromthymol blue
- methyl orange
- litmus
- phenolphthalein
3.
At what pH value would methyl orange and thymol blue both turn yellow?
- 3.0
- 9.0
- 6.3
- 4.0
4.
If a solution were to turn litmus blue, which of the following substances would most likely be present in this solution?
- [math]NaOH[/math]
- [math] H_2 O [/math]
- [math] HN O_3 [/math]
- [math]HCl[/math]
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?
- It would turn the indicator blue
- It would turn the indicator red
- It would turn the indicator yellow
- It would turn the indicator pink
6.
What is the color of methyl orange for a sample of potassium hydroxide, KOH?
- red
- orange
- yellow
- It cannot be determined, based on the information given
7.
Which of the following solutions would most likely turn bromcresol green yellow?
- [math] CH_3 OH [/math]
- NaOH
- [math] CH_3 COOH [/math]
- [math] H_2 [/math]
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?
- methyl orange
- bromthymol blue
- thymol blue
- 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?
10.
Phenolphthalein helps to provide the end point of a titration with a reasonable amount of accuracy.
- True
- False
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