What is true about a solution with a pH less than 7?

A solution with a pH less than 7 is classified as an acid. The pH scale ranges from 0 to 14, where a pH of 7 is considered neutral (like pure water). Values below 7 indicate increasing acidity, while values above 7 indicate basicity or alkalinity.

Acids are substances that can donate protons (H⁺ ions) in an aqueous solution, resulting in a decrease in pH. The lower the pH value, the higher the concentration of hydrogen ions, which characterizes a solution as an acid. Therefore, stating that a solution with a pH less than 7 is an acid is accurate and reflects fundamental principles of acid-base chemistry.