The Indicator Phenolphthalein Changes from Colorless to Pink Between PH

question 53

Multiple Choice

The indicator phenolphthalein changes from colorless to pink between pH 8.2 and pH 10. If phenolphthalein is added to a solution, and the solution remains colorless, then

• A)the solution is acidic, and the pH must be at or below 7.0.
• B)the pH of the solution must be below 8.2, and the solution is basic.
• C)the pH of the solution must be below 8.2, but the solution could be either acidic or basic.
• D)the pH of the solution must be above 10, and the solution is basic.
• E)the pH of the solution is above 10, and the solution is acidic.

---

Definitions:

Public Lands

Areas owned and maintained by the government for the use and benefit of the general public.

Earth's Ecosystems

The complex networks of living organisms and their physical environment present on Earth, interacting as a system and including both natural and human-modified ecosystems.

Wilderness Areas

Natural environments on Earth that have not been significantly modified by human activity, designated for conservation and as habitats for numerous species.

Biological Diversity

The encompassing term for the variety among living organisms from all sources, including terrestrial, marine, and other aquatic ecosystems.