Which of the following best describes the defining chemical characteristic of potable water?

• A. It is free from harmful contaminants and is safe for human consumption.
• B. It is completely free of any microorganisms.
• C. It contains no dissolved ions or minerals.
• D. It has a pH exactly equal to 7.0.

Answer: (A)

Verified step by step guidance

1. Understand the term 'potable water': Potable water is water that is safe for human consumption, meaning it does not contain harmful contaminants that could cause illness.
2. Recognize that potable water does not need to be completely free of microorganisms, but harmful pathogens must be absent or below harmful levels.
3. Know that potable water can contain dissolved ions and minerals; in fact, many minerals are naturally present and can be beneficial.
4. Realize that potable water does not have to have a pH exactly equal to 7.0; it can be slightly acidic or basic but still be safe to drink.
5. Conclude that the defining chemical characteristic of potable water is that it is free from harmful contaminants and safe for human consumption.