Anna is conducting an experiment using a pH indicator that is red at low pH, green at neutral pH and purple at high pH. She starts with a green solution. When she adds compound X to her solution it turns purple. Then she adds compound Z to the solution and it turns green. She adds more Z, the solution remains green. These observations suggest X is ________ and Z is ________.
A. a base; a buffer
B. an acid; a base
C. a base; a strong acid
D. an acid; a buffer
E. a buffer; a base
Answer: A
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The experiment was designed to determine
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