Final answer:
Water is neutral due to its pH of 7, which is the midpoint of the pH scale indicating neither acidity nor alkalinity.
Step-by-step explanation:
Water is considered a neutral substance because it has a pH of 7, which is the point of neutrality on the pH scale. The pH scale measures the acidity or alkalinity of a solution and ranges from 0 to 14. Pure water has a very low concentration of hydronium ions, with about 1 in 10 million water molecules breaking down to form a hydronium ion. This results in water being neither acidic nor alkaline, but instead neutral. A pH less than 7 indicates acidity, while a pH greater than 7 indicates alkalinity. Blood, for example, has a slightly alkaline pH of 7.4, while the stomach environment is highly acidic with a pH of 1 to 2.