Ww2 Minorities

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Introduction to Acids and Bases
Why?
Is water an acid, a base, neither, or both? There are three different ways to define a substance as an acid or base. One definition is based on the ions found in a compound (Arrhenius), another is based on how a compound behaves when added to water (Bronsted-Lowry), and a third is based on how a molecule reacts with other molecules (Lewis). These definitions address different behaviors of compounds and explain how seemingly different compounds can be classified as behaving like an acid or a base.

Success Criteria





Define an acid according to the Arrhenius definition and the Bronsted-Lowry definition. Define a base according to the Arrhenius definition and the Bronsted-Lowry definition. Identify acids and bases that illustrate the Arrhenius definition and
Bronsted-Lowry definition.
Explain the acid-base properties of amphiprotic substances.

Information
Acid –
• a compound that yields hydronium ions, H3O+(aq), as positive ions in aqueous solution (Arrhenius definition).
• a compound that donates a hydrogen ion (H+) to another species (BronstedLowry definition).
Base –
• a compound that yields hydroxide ions, OH-(aq), as negative ions in aqueous solution (Arrhenius definition).
• a compound that accepts a hydrogen ion, (H+), from another species
(Bronsted-Lowry definition).
Neutral solution –
• contains hydrogen ions and hydroxide ions in equal concentrations.
Note: In the context of acid-base chemistry, the hydrogen ion usually is referred to as a proton because an atom of hydrogen contains one proton and one electron when it loses the electron during ion formation all that is left is the nucleus, which is one proton.

© POGIL – 2005
Authored by Josephine Parlagreco and Robert Dayton
Edited by Linda Padwa and David Hanson, Stony Brook University

1/4

Introduction to Acids and Bases

Model
1.

NaOH(s) + H2O(l) → Na+(aq) +…...

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