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PH . ANTACIDS INTRODUCTION LABORATORY SIMULATION 1) What is the purpose of testing DI water without an antacid? A. Water is a test sample. O) B. Water is a positive control. C. Water is a negative control. O D. Water is neutral. 2) What is the function of phenol red in this experiment? O A. It is a buffer. O B. It is a base. O C. It is an indicator