What represents a base on the pH scale?

On the pH scale, a base is represented by a blue color. The pH scale ranges from 0 to 14, with values below 7 indicating acidity and values above 7 indicating basicity (or alkalinity). When substances are tested with pH indicators, those that yield a blue color typically have a pH above 7, which signifies a basic solution.

In contrast, acidic solutions often turn pH indicators red, falling on the lower end of the pH scale. Neutral solutions, like pure water, are represented by green in many pH indicator systems. Therefore, blue, as the representation of a base, is associated with higher pH values, which are indicative of more basic solutions.