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.
What we call pH is short for the potential of hydrogen. It is a measure of the acidity or alkalinity of our bodyâs fluids and tissues. It is measured on a scale from 0 to 14. The more acidic a solution is, the lower its pH. The more alkaline, the higher the number is. A pH of 7 is perfectly neutral.