Anna Is Conducting an Experiment Using a PH Indicator That

question 17

Multiple Choice

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) a buffer; a base
• E) an acid; a buffer

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