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.
pH is a measurement of the acidity of your water. The lower the pH, the more acidic your water; the higher, the more alkaline. The pH of water should be 7 to be neutral. Usually it will be more than 7 indicating that it is slightly alkaline. If the pH is lower it indicates that the water is acidic in nature.