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  1. pH - Wikipedia

    In chemistry, pH (/ piːˈeɪtʃ / pee-AYCH), also referred to as acidity or basicity, historically denotes " potential of hydrogen " (or "power of hydrogen"). [1] . It is a logarithmic scale used to specify …

  2. PH | Definition, Uses, & Facts | Britannica

    May 16, 2025 · PH, 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 …

  3. What Is pH? The pH Formula & Equation - ChemTalk

    Read on to learn vocabulary associated with pH, how to use the pH formula, how to calculate pH, and why pH is an important measurement! Test tubes containing substances of different pH as …

  4. pH Scale: Definition, Chart, Values, & Range - Chemistry Learner

    pH is a measure of how acidic or basic a substance is. It takes a numerical value between 0 and 14 that measures the relative amount of free hydrogen and hydroxyl ions in water. Water …

  5. 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 …

  6. What is pH? - US EPA

    Nov 4, 2024 · Each whole pH value is ten times stronger than the next outer or more extreme value. For example, a pH of 4 is ten times more acidic than a pH of 5. A pH of 9 is ten times …

  7. 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 …

  8. What is pH? - BYJU'S

    The pH level, or possible level of hydrogen in your body, is determined by the food and type of drink you consume. The pH is the concentration of the hydrogen ions. This calculation is …

  9. pH - Definition, Calculation, and Significance - Science Info

    Dec 17, 2022 · The term “pH” stands for “potential of hydrogen,” and it is a unit of measurement for the concentration of hydrogen ions in a solution. The concept of pH was first introduced by …

  10. pH Scale - pH | Dilution | Concentration - PhET Interactive …

    Test the pH of things like coffee, spit, and soap to determine whether each is acidic, basic, or neutral. Visualize the relative number of hydroxide ions and hydronium ions in solution.

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