Tennessee Esthetician Practice Exam

The numeric range of alkaline substances refers to their position on the pH scale, which measures acidity and alkalinity. A substance is considered alkaline if its pH value is above 7. In this context, any pH measurement greater than 7 indicates a basic or alkaline nature.

This means that alkaline substances can have a pH that starts just above 7 and extends to any higher value, without an upper limit defined in this context. Thus, the correct answer encompasses all alkaline solutions, which are recognized for having the ability to neutralize acids.

Other options do not accurately represent the full range of alkaline substances. For example, while some alkaline solutions do fall within the specified ranges in other options, they do not capture the entirety of what is classified as alkaline, which is anything above pH 7.