Certified Arborist Practice Test

Question: 1 / 400

On the pH scale, what classification is assigned to a measurement greater than 7?

Acidic

Neutral

Alkaline

A measurement greater than 7 on the pH scale is classified as alkaline or basic. The pH scale ranges from 0 to 14, with lower values indicating acidity, a middle value of 7 representing neutrality (like pure water), and values above 7 indicating a greater concentration of hydroxide ions (OH-) than hydrogen ions (H+), which characterizes alkaline or basic substances. This higher pH means that the solution has a lower concentration of hydrogen ions, contributing to its alkaline properties. Understanding the pH scale is essential in arboriculture, as it can influence soil health, plant nutrient availability, and overall plant health.

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