pH - Wikipedia
In chemistry, pH (/ piːˈheɪtʃ / or / piːˈeɪtʃ /; pee-AYCH) is a logarithmic scale used to specify the acidity or basicity of aqueous solutions. Acidic solutions (solutions with higher concentrations of hydrogen (H+) …
What Is pH? - Definition, Uses, Facts - Science Notes and Projects
Aug 2, 2025 · Key Takeaways: What Is pH? pH measures the concentration of hydrogen ions (H⁺) in a solution and indicates whether a solution is acidic, neutral, or basic. The pH scale typically ranges …
PH | Definition, Scale, Uses, Examples, & Facts | Britannica
Jan 12, 2026 · A pH value is the quantitative measure of the acidity or basicity of aqueous or other liquid solutions. The term, widely used in chemistry, biology, and agronomy, translates the values of the …
PH Definition & Meaning - Merriam-Webster
Kids Definition pH noun (ˈ)pē-ˈāch : a number used in expressing acidity or alkalinity on a scale whose values run from 0 to 14 with 7 representing neutrality, numbers less than 7 increasing acidity, and …
pH - Definition, Calculation, and Significance - Science Info
Dec 17, 2022 · pH is defined as the negative logarithm of the concentration of H+ ions. As a result, the meaning of the name is justified as hydrogen power. We know that not all acids and bases react at …
What is pH? The pH Formula & Equation - ChemTalk
The formula for pH is shown above. pH is defined as the negative log base 10 of the hydronium concentration. The pH is a logarithmic measure of the concentration of hydrogen ions in a solution.
What is pH? - US EPA
Nov 4, 2025 · A substance that is neither acidic nor alkaline is neutral. The pH scale measures how acidic or alkaline a substance is. The scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than …
15.7: An Introduction to pH - Chemistry LibreTexts
pH is defined as the negative log of hydrogen ion concentration. It can be used to describe the relative acidity (or basicity) of a solution. Because it is based on a logarithmic scale, a change in …
pH Scale: Definition, Chart, Values, & Range - Chemistry Learner
pH is a scale used to measure the acidity or basicity of a solution. It ranges from 0 to 14 and reflects the relative concentration of hydrogen ions (H⁺) and hydroxide ions (OH⁻) in aqueous solutions.
What Is pH and What Does It Measure? - ThoughtCo
Jun 10, 2025 · pH is a measure of how acidic or basic a solution is, from 0 to 14. pH is important for chemical reactions in areas like medicine, cooking, and agriculture. Scientists use pH meters and …