What is the name for a solution that has a pH lower than 7?

A solution that has a pH lower than 7 is referred to as an acidic solution. The pH scale ranges from 0 to 14, where a pH of 7 is considered neutral, indicating neither acidity nor alkalinity. When the pH is below 7, it indicates an increase in hydrogen ion concentration, which is characteristic of acidic solutions.

In contrast, solutions with a pH higher than 7 are classified as basic or alkaline. Therefore, the designation of a solution as "acidic" specifically applies when it has a pH significantly less than 7, differentiating it from neutral and basic solutions. This understanding of the pH scale is critical in various scientific and practical applications, including chemistry, biology, and environmental science.