0.01 M HCl solution has a pH of 2. Suppose that during the experiment, both the universal pH indicator and the cabbage indicator turn orange-red for 0.01 M HCl. What can you conclude about the the cabbage indicator key?
Answer
A
It matches the universal pH indicator and is indicating the proper pH.
B
It should completely match the universal indicator key for all pH values greater than 7 (base).
C
It should completely match the universal indicator key for all pH values.
D
There was some sort of experimental error, because the indicators should never match.
Explanation
A 0.01 M HCl solution has a known pH of 2, so both indicators turning orange-red shows that the cabbage indicator key gives a color consistent with the universal indicator at pH 2. This supports that it is indicating the proper pH in this test. One matching result does not show that the two keys match at every pH.
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