17. Acid and Base Equilibrium

Amphoteric

8.1 Amphiprotic species (SL)

The hydrogen sulfite ion 1HSO3-2 is amphiprotic. Write a balanced chemical equation showing how it acts as an acid toward water and another equation showing how it acts as a base toward water.

Write an equation for the reaction in which H2C6H7O5-1aq2 acts as an acid in H2O1l2.

Understanding Amphoteric Species

Acids and Bases - Basic Introduction - Chemistry

An amphoteric species is one that can act as an acid or base depending on the reactants involved.&#160;

Aqueous solutions of hydrogen sulfide contain H2S, HS-, 
S2-, H3O+ , OH-, and H2O in varying concentrations. Which 
of these species can act only as an acid? Which can act only as 
a base? Which can act both as an acid and as a base?

Acids and Bases, pH and pOH

Amphoteric Substances & Conjugate Bases

Correct, water can act as an acid or a base.

While this statement is true for pure water, it is not illustrated by the given reactions.

 Review substances that are capable of acting as either an acid or a base. 

As shown by the equations: H2O + HCO3&#8722; &#8646; H3O+ + CO32&#8722; H2O + HCO3&#8722; &#8646; H2CO3 + OH&#8722;

Which of the following species is/are amphoteric?

Amphoteric Species

Both H2O and H2PO4- are amphoteric. Write an equation to
show how each substance can act as an acid and another equation
to show how each can act as a base.

Write an equation for the reaction in which H2C6H7O5-1aq2 acts as a base in H2O1l2.

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Ionic Salts

Polyprotic Acid

A&#160;polyprotic acid&#160;possesses more than 2 hydronium ions (H+).&#160;

Diprotic Acid

A diprotic acid&#160;is an acid that can donate two hydronium ions (H+).&#160;

Identifying Acids and Bases

Arrhenius Acid and Base

Bronsted Lowry Acid and Base

Lewis Acid and Base

pH and pOH

Ka and Kb

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