What is the pH of a neutral solution?

A neutral solution, such as pure water at 25 degrees Celsius, has a pH of exactly seven. The pH scale ranges from 0 to 14, where values below seven indicate acidity and values above seven indicate alkalinity. A pH of seven signifies that the concentrations of hydrogen ions (H⁺) and hydroxide ions (OH⁻) are equal, making the solution neutral. This balance is crucial in understanding the behavior of acids and bases in chemistry, as it serves as a benchmark for comparing other solutions.

The options indicating values of five, nine, or eleven reflect either acidic or basic conditions, which are not neutral. Therefore, the value of seven is the definitive representation of a neutral solution on the pH scale.