Which pH range is considered alkaline?

Alkaline substances are defined by a pH level greater than 7. The pH scale ranges from 0 to 14, with 7 being neutral. A pH value above 7 indicates a basic or alkaline condition, and the higher the value, the more alkaline the substance is. Specifically, a pH above 9.5 represents a strong alkaline condition.

The other ranges indicate acidic or neutral states: a pH below 5.5 denotes an acidic environment, while a pH between 5.5 and 7 is slightly acidic to neutral. A pH exactly at 7 is neutral, meaning it is neither acidic nor alkaline. Therefore, the option that specifies a pH above 9.5 correctly identifies it as alkaline.