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A few drops of universal indicator are added to an unknown solution and the solution turns green. What is the approximate pH of the solution? pH 2 pH 10 pH 7 pH 14 pH 5 A few drops of phenolphthalein are added to an Erlenmeyer flask containing hydrochloric acid. This is titrated against a buret filled with sodium hydroxide. What color change is observed when the end point of the titration is reached? Yellow to pink. Yellow to red. Pink to colorless. Colorless to pink. SAFETY: Damage to the pH probe can be prevented by: (More than one answers may be correct) keeping the electrode dry when not in use. avoiding placing it near the edge of the bench. using a clamp to hold the probe when not in use. drying the electrode bulb with filter paper. placing it in a sink when not in use.
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