Based on the information given, we can determine the pH of the unknown solution.
Litmus paper turns blue at pH 8 and above, so the unknown liquid has a pH of 8 or higher.
The phenolphthalein indicator does not change color, indicating that the pH of the unknown liquid is not within the range where phenolphthalein can detect a change.
Thymol blue turns yellow at pH values between 2 and 6, implying that the pH of the unknown liquid is within this range.
Based on these observations, the pH of the unknown solution is most likely 2.
Therefore, the correct answer is A. 2
The table below shows the color of three indicators at different pH values.
Indicator pH=0 pH=2 pH=4 pH=6 pH=8 pH=10 pH=12 ph=14
Litmus paper Red Red Red Red Blue Blue Blue Blue
Phenolphthalein No change No change No change No change No change Pink Pink Pink
Thymol blue Red Red Yellow Yellow Yellow Blue Blue Blue
An unknown liquid is tested with three indicators:
• The unknown liquid turns litmus paper blue.
• The unknown liquid is not affected by phenolphthalein indicator.
• The unknown liquid turns yellow when tested with thymol blue indicator.
What is the pH of the unknown solution?
A.
2
B.
6
C.
8
D.
12
1 answer