National League for Nursing (NLN) Science Practice Exam

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A hydrogen ion concentration of 1 × 10−7 M in a solution is considered?

  1. basic.

  2. alkali.

  3. acidic.

  4. neutral.

The correct answer is: neutral.

A hydrogen ion concentration of 1 × 10−7 M corresponds to a pH of 7, which is defined as neutral on the pH scale. The pH scale ranges from 0 to 14, where values below 7 indicate acidity, and values above 7 indicate alkalinity or basicity. Therefore, a solution with a hydrogen ion concentration that results in a pH of 7 is neither acidic nor basic; it is neutral. This concept is fundamental in understanding acid-base chemistry, where the neutrality of water (which also has a hydrogen ion concentration of 1 × 10−7 M at 25°C) serves as a standard reference point.

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