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

    Oct 18, 2025 · Acid, any substance that in water solution tastes sour, changes the color of certain indicators (e.g., reddens blue litmus paper), reacts with some metals (e.g., iron) to liberate …

  2. ACID Definition & Meaning - Merriam-Webster

    The meaning of ACID is a sour substance; specifically : any of various typically water-soluble and sour compounds that in solution are capable of reacting with a base to form a salt, redden …

  3. 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 …

  4. 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.

  5. ACID | English meaning - Cambridge Dictionary

    ACID definition: 1. any of various usually liquid substances that can react with and sometimes dissolve other…. Learn more.

  6. 6.1: What is an Acid and a Base? - Chemistry LibreTexts

    An acid is a substance that forms hydrogen ions H + when dissolved in water, and A base is a substance that forms hydroxide ions OH - when dissolved in water. For example, hydrochloric …

  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 in Chemistry? | The Chemistry Blog

    Sep 24, 2025 · What Is an Acid in Chemistry? Acids are one of the most important groups of chemicals, found everywhere from household products to industrial processes. They are …

  9. Acids – Definition, Types, Examples, Properties, Uses

    Jul 10, 2024 · In simple terms, acids are substances that taste sour and can turn blue litmus paper red, indicating their acidic nature. They’re known for their ability to react with bases to …

  10. Acid: Definition and Examples in Chemistry - ThoughtCo

    Jan 13, 2020 · An acid is a chemical that gives away protons or accepts electrons, like vinegar or lemons. There are different kinds of acids, like Arrhenius, Brønsted-Lowry, and Lewis acids. …