any of the major appearances or aspects in which a thing of varying modes or conditions manifests itself to the eye or mind. 2. a stage in a process of change or development: Each phase of life brings its own joys. 3. a side, aspect, or point of view: This is only one phase of the question.
The pH of a neutral solution is 7. At this pH, the solution has equal concentrations of both the H+ and OH- ions, which is 10^-7 mole/litre. The presence of both the hydrogen and hydroxyl ions in equimolar concentrations makes the solution neutral.
The pH of the human body will never reach the neutral (7.00) before the condition becomes fatal. If the pH of the human body raises, the condition is called alkalinosis. This condition is also fatal. The human body has a slightly acid pH of 7.35-7.45.