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    Fundamentals of Acids and Bases

    Chemistry

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      • Fundamentals of Acids and Bases
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    Terms

    Terms
    • Acid

      A substance that has the potential to donate a proton or accept an electron pair.

    • Acidic

      Having a pH less than 7 or a pOH greater than 7.

    • Amphiprotic

      A species that can either donate or accept a proton, e. g. water.

    • Amphoteric

      A species that can either donate or accept a hydroxide ion, such as Al(OH)3. Many chemistry texts incorrectly use this term to mean that a substance can act as either an acid or a base.

    • Arrhenius Model

      Arrhenius proposed that acids are substances that produce protons (H+) in aqueous solution, whereas bases produce hydroxide ions (OH-) in aqueous solution. Compare his model with the Bronsted-Lowry definition and the Lewis definition.

    • Base

      A substance that can accept a proton, release OH-, or donate an electron pair.

    • Basic

      Having a pH greater than 7 or a pOH less than 7.

    • Bronsted-Lowry Definition

      Bronsted and Lowry define an acid as a proton (H+) donor and a base as a proton acceptor. Compare this model with the Arrhenius Model and the Lewis definition.

    • Conjugate Acid

      A molecule that can be described as a base that has gained one proton.

    • Conjugate Base

      A molecule that can be described as an acid that has lost one proton.

    • Dissociate

      Separate into its ion constituents.

    • Lewis Definition

      Lewis defined an acid as an electron pair acceptor and a base as an electron pair donor. Compare his model with the Arrhenius model and the Bronsted-Lowry definition.

    • Oxyacid

      A molecule of the form AOn(OH)m, where A is a non-metal.

    • Pauling-Ricci rule

      For oxyacids, the more electron withdrawing (more electropositive) the non- metal center, the stronger the acid due to a weakening of the O-H bond. This trend is approximated by the equation: PKa= 8 - 9f + 4n, where f is the formal charge on A when all oxygens are singly bound to A, and n represents the number of O atoms bound to A that are not bound to an H.

    • pH

      A measure of the hydrogen ion concentration, it is equal to - log [H+], where [H+] is the concentration of protons.

    • pKa

      A measure of the strength of an acid, it is equal to – log Ka, where Ka is the acid dissociation constant in water.

    • pKb

      A measure of the strength of a base, it is equal to – log Kb, where Kb is the base dissociation constant in water.

    • pOH

      A measure of the hydroxide ion concentration, it is equal to - log [OH-], where [OH-] is the concentration of hydroxide ions.

    • Strong Acid

      An acid with a pKa less than zero. Strong acids completely dissociate in water.

    • Strong Base

      A base with a pKb less than zero. Strong bases completely dissociate in water.

    • Weak Acid

      An acid with a pKa greater than zero. Weak acids do not completely dissociate in water.

    • Weak Base

      A base with a pKb greater than zero. Weak bases do not completely dissociate in water.

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