Certified Arborist Practice Test

Question: 1 / 400

On the pH scale, what is the classification of a substance that measures less than 7?

Acidic

A substance that measures less than 7 on the pH scale is classified as acidic. The pH scale ranges from 0 to 14, where values below 7 indicate acidity, values of 7 indicate neutrality, and values above 7 indicate alkalinity or basicity.

When the pH is less than 7, it signifies higher concentrations of hydrogen ions (H+) in the solution, which is characteristic of acids. Common examples of acidic substances include vinegar and lemon juice. This understanding of the pH scale is essential for arborists, as soil pH can significantly influence tree health, nutrient availability, and overall plant growth.

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Neutral

Alkaline

Basic

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