Here's why:

* pH scale: The pH scale measures the acidity or alkalinity of a solution. It ranges from 0 to 14.

* Acidic: Solutions with a pH less than 7 are acidic.

* Alkaline (or basic): Solutions with a pH greater than 7 are alkaline.

* Neutral: A pH of 7 indicates a neutral solution, meaning it is neither acidic nor alkaline.

Pure water has a pH of 7.