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  1. Acid | Definition, Examples, Types, Uses, & Facts | Britannica

    Dec 12, 2025 · An acid is any substance that in water solution tastes sour, changes blue litmus paper to red, reacts with some metals to liberate hydrogen, reacts with bases to form salts, …

  2. ACID Definition & Meaning - Merriam-Webster

    Savannah police and the FBI are continuing to follow any possible leads to find whoever is responsible for the acid attack in a local park that left a woman with severe burns.

  3. ACID Definition & Meaning | Dictionary.com

    An acid is the opposite of a base and has a pH of 0 to 7. A given amount of an acid added to the same amount of a base neutralizes the base, producing water and a salt.

  4. Acid - Simple English Wikipedia, the free encyclopedia

    The definition of an acid has changed as people discovered more about chemistry. Acids were originally grouped together by their properties: they taste sour, change the color of litmus …

  5. ACID | definition in the Cambridge English Dictionary

    Basic rocks with no quartz tend to be dark-colored, while acid rocks are much lighter. The solid matter ejected by a volcano covers all rock compositions from basic to acid.

  6. pH Scale: Acids, bases, pH and buffers (article) | Khan Academy

    Acidity and basicity, proton concentration, the pH scale, and buffers.

  7. What Is an Acid in Chemistry? Definition and Examples

    Feb 14, 2023 · In chemistry, an acid is a chemical species that donates hydrogen ions or protons or accepts an electron pair. Acids react with bases and some metals via a neutralization …

  8. What Is an Acid? Definition, Examples, and pH Scale

    Jul 30, 2025 · Acids are defined by their behavior in solution. One common definition, known as the Brønsted-Lowry theory, describes an acid as a substance capable of donating a proton, a …

  9. Acid - definition of acid by The Free Dictionary

    1. Chemistry a. Of, relating to, or containing an acid. b. Having a high concentration of acid. c. Having the characteristics of an acid. 2. a. Having a pH of less than 7. b. Having a relatively …

  10. Acid - Wikiwand

    An acid is a molecule or ion capable of either donating a proton (i.e. hydrogen cation, H+), known as a Brønsted–Lowry acid, or forming a covalent bond with an ...