Question
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
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
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