Pure water has a pH of 7 at 25 °C, meaning it is neutral. When an acid is dissolved in water, the pH will be less than 7, while a base, or alkali, will have a pH greater than 7.

pH is measured on a logarithmic scale. The formula for pH is. Where [H +] is the hydrogen ion concentration. The range of pH goes from 0 to 14. A value less than 7 indicates that water is …

Nov 4, 2025 · A pH less than 7 is acidic, and a pH greater than 7 is basic. Pure water is neutral, with a pH of 7.0. When chemicals are mixed with water, the mixture can become some level of …

Sep 30, 2020 · The pH scale measures how acidic, neutral, or basic a substance is in water, ranging from 0 (strong acid) to 14 (strong base), with 7 as neutral. Acids have pH < 7, bases …

Jan 24, 2023 · pH is a measure of the concentration of hydrogen ions in a solution. The more hydrogen ions that are present, the more acidic is the solution. The pH scale ranges from zero …

Interactive pH scale chart with examples, colors, and detailed explanations. Perfect for students and educators learning about acidity and alkalinity.

Explore how and why the pH scale provides a quantitative measure of acidity or basicity—where neutral water has pH 7, and pH values below or above indicate acidic or basic solutions …

pH is commonly defined as a logarithmic function of [H +]: pH is usually (but not always) between 0 and 14. Knowing the dependence of pH on [H +], we can summarize as follows: If pH < 7, …

The pH scale ranges from 0 to 14, where a pH of 7 is considered neutral. Solutions with a pH less than 7 are acidic, with lower values indicating stronger acidity.

Nov 7, 2025 · Values below 7 are acidic, and values above 7 are basic. Pure water has a neutral pH of 7. When substances dissolve in water, they can shift the pH. For example, vinegar and …