Ch.15 - Acid and Base EquilibriumWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds
Understanding Amphoteric Species

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

Concept #1: Understanding Amphoteric Species. 

Practice: Which of the following species is/are amphoteric?

Additional Problems
Which is the name given to a substance that can act as a Bronsted acid or as a Bronsted base according to with what it is reacting? A) hydrophilic B) hydrophobic C) amphoteric D) isoprotic E) isoelectronic
Describe amphoteric behavior and give an example.
The hydrogen sulfite ion (HSO3-) is amphiprotic.Write a balanced chemical equation showing how it acts as an acid toward water.
The hydrogen sulfite ion (HSO3-) is amphiprotic.What is the conjugate acid of HSO3-?
The hydrogen sulfite ion (HSO3-) is amphiprotic.Write another equation showing how it acts as a base toward water.
The hydrogen sulfite ion (HSO3-) is amphiprotic.What is the conjugate base of HSO3-?
Which of the following is not amphoteric? A) H 2O           B) HCl             C) H 2PO 4 −      D) HCO 3 −       E) HS −  
What does amphoteric mean? a) can be both oxidized or reduced b) can act as either an acid or a base c) can act as either a gas or liquid d) can be either titrated or diluted e) can be either solubilized or dissolved
The simplest amino acid is glycine, H2NCH2CO2H. The common feature of amino acids is that they contain the functional groups: an amine group, –NH2, and a carboxylic acid group, –CO2H. An amino acid can function as either an acid or a base. For glycine, the acid strength of the carboxyl group is about the same as that of acetic acid, CH3CO2H, and the base strength of the amino group is slightly greater than that of ammonia, NH3.(a) Write the Lewis structures of the ions that form when glycine is dissolved in 1 M HCl and in 1 M KOH.
The simplest amino acid is glycine, H2NCH2CO2H. The common feature of amino acids is that they contain the functional groups: an amine group, –NH2, and a carboxylic acid group, –CO2H. An amino acid can function as either an acid or a base. For glycine, the acid strength of the carboxyl group is about the same as that of acetic acid, CH3CO2H, and the base strength of the amino group is slightly greater than that of ammonia, NH3.(b) Write the Lewis structure of glycine when this amino acid is dissolved in water. (Hint: Consider the relative base strengths of the –NH2 and −CO2− groups.)
Both H2O and H2PO4– are amphoteric. Write an equation to show how H2PO4– can act as an acid with H2O acting as a base.
Both H2O and H2PO4– are amphoteric. Write an equation to show how H2PO4– can act as a base with H2O acting as an acid.
Both HCO3– and HS– are amphoteric. Write an equation to show how HCO3– can act as a base with HS– acting as an acid.
Both HCO3– and HS– are amphoteric. Write an equation to show how HCO3– can act as an acid with HS– acting as a base.
What are amphiprotic species? Illustrate with suitable equations.
State the following specie is amphiprotic and write chemical equations illustrating the amphiprotic character of this specie:(a) H2O
State the following specie is amphiprotic and write chemical equations illustrating the amphiprotic character of this specie:(b) H2 PO4 −
State the following specie is amphiprotic and write chemical equations illustrating the amphiprotic character of this specie:(c) S2−
State the following specie is amphiprotic and write chemical equations illustrating the amphiprotic character of this specie:(d) CO3 2−
State the following specie is amphiprotic and write chemical equations illustrating the amphiprotic character of this specie:(e) HSO4 −
State the following specie is amphiprotic and write chemical equations illustrating the amphiprotic character of this specie:(a) NH3
State the following specie is amphiprotic and write chemical equations illustrating the amphiprotic character of this specie:(b) HPO4 −
State the following specie is amphiprotic and write chemical equations illustrating the amphiprotic character of this specie:(c) Br−
State the following specie is amphiprotic and write chemical equations illustrating the amphiprotic character of this specie:(d) NH4 +
State the following specie is amphiprotic and write chemical equations illustrating the amphiprotic character of this specie:(e) ASO4 3−
Aluminum hydroxide is an amphoteric substance. It can act as either a Brønsted–Lowry base or a Lewis acid. Write a reaction showing Al(OH)3 acting as a base toward H+ and as an acid toward OH-.
Zinc hydroxide is an amphoteric substance. Write equations that describe Zn(OH) 2 acting as a Brønsted-Lowry base toward H+ and as a Lewis acid toward OH -.
What does amphoteric mean?a. can be both oxidized or reducedb. can act as either an acid or a basec. can act as either a gas or a liquidd. can be either titrated or dilutede. can be either solubilized or dissolved
Classify the acidity of hydrochloric acid, HCl, based on its reactivity in aqueous solution.Choose 1 answer:a. weak acidb. strong acid