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  1. 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 …

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

    Dec 5, 2025 · 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 …

  3. What Is pH and What Does It Measure? - ThoughtCo

    Jun 10, 2025 · Here is an explanation of what pH measurements are in chemistry, how pH is calculated, and how it's used.

  4. What is pH? The pH Formula & Equation - ChemTalk

    This article explains the concept of pH, how to find and calculate the pH, and how the pH formula and pH equation are used in chemistry!

  5. What is pH? - US EPA

    Nov 4, 2025 · What is pH? Acidic and alkaine (or "basic") are two extremes that describe substances, usually liquids or chemicals, just like hot and cold are two extremes that describe …

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

    What is the pH scale. What does it measure. Check out a few examples with a diagram. Learn its equation, colors, and its importance in science.

  7. 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.