Which pH value is neutral?

• A. 0 to 2
• B. 3 to 6
• C. 7
• D. 12 to 14

Answer: (C)

pH measures how acidic or basic a solution is, based on hydrogen ion concentration. The neutral point on the standard pH scale at room temperature is seven, where the concentrations of hydrogen ions and hydroxide ions are equal. That equality means the solution is neither acidic nor basic. Values below seven indicate acidity, with lower numbers being stronger acids, while values above seven indicate basicity, with higher numbers being stronger bases. So the neutral value is seven, making a pH of seven the correct choice.