Acids and Bases Terms
A molecule that changes color depending on the pH of the solution it is in. It's sort of like a chameleon, but not. Actually, it's nothing like a chameleon.
Acid-Dissociation Constant (Ka)
The equilibrium constant for a reaction in which a reactant (an acid) donates a proton to water forming H3
A solution that has a greater concentration of H3
molecules compared to the concentration of OH-
A molecule that releases a proton (H+
) in water.
A molecule that releases hydroxide (OH-
) in water.
Base-Dissociation Constant (Kb)
The equilibrium constant for a reaction in which a reactant (a base) accepts a proton from water forming OH-
A solution that has a greater concentration of OH-
molecules compared to the concentration of H3
A molecule that donates a proton (H+
) to a proton acceptor molecule.
A molecule that accepts a proton (H+
) from a proton donor molecule.
The ability of a buffer solution to absorb added H+
without significant changes in pH.
A solution of a weak acid or base in equilibrium with its conjugate base or acid that resists large changes in pH.
The molecule resulting after an acid donates a proton (H+
Conjugate Acid-Base Pairs
An acid and its conjugate base or a base and its conjugate acid.
The molecule resulting after a base accepts a proton (H+
An acid that has two protons (H+
) available to transfer to a base (or water).
The region of a titration curve that exhibits a sharp change in pH at which point equivalent amounts of acid and base have been mixed.
ion that results when a proton is transferred to H2
ion that results when a proton is lost from H2
Ion-Product Constant For Water
The equilibrium constant for the dissociation of water to give a hydronium ion and a hydroxide ion.
An electron-pair acceptor.
An electron-pair donor.
An acid that has just one proton to transfer.
A solution that has an equal concentration of H3
molecules (1 ×
M at 25°
A reaction between an acid and base that results in the production of H2
O and brings the pH of the reaction solution closer to neutrality.
The concentration of acid (or base) that dissociates at equilibrium divided by the initial concentration of acid.
The scale on which the acidity or basicity of a solution is measured. The pH equals –log([H3
PH Titration Curve
A plot of the pH of a solution (usually measured with a pH meter), versus the volume of added titrant.
An acid that can transfer two or more protons.
The proton transfer reaction of a weak acid/base equilibrium that progresses furthest to the right and has the largest equilibrium constant.
An acid that nearly fully dissociates in water.
The reaction(s) involved in a weak acid/base equilibrium that do not contribute to significant changes in product concentrations (that is, reactions that are not the principle reaction).
The incremental addition of a strong acid or base to a solution of acid or base.
An acid that slightly dissociates in water.
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