Acids and Bases. Arrhenius Acid & Base Which beaker contains a base?
Preview Lesson Starter Objectives Acids Bases Arrhenius Acids and Bases Chapter 14.
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Transcript of Preview Lesson Starter Objectives Acids Bases Arrhenius Acids and Bases Chapter 14.
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Preview
• Lesson Starter• Objectives• Acids• Bases• Arrhenius Acids and Bases
Chapter 14
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Lesson Starter
• The solutions in the beakers are different because they have a different pH.
• One beaker contains a basic solution and the other beaker contains an acidic solution
Chapter 14Section 1 Properties of Acids and Bases
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Objectives• List five general properties of aqueous acids and
bases.
• Name common binary acids and oxyacids, given their chemical formulas.
• List five acids commonly used in industry and the laboratory, and give two properties of each.
• Define acid and base according to Arrhenius’s theory of ionization.
• Explain the differences between strong and weak acids and bases.
Chapter 14Section 1 Properties of Acids and Bases
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Acids
1. Aqueous solutions of acids have a sour taste.
2. Acids change the color of acid-base indicators.
3. Some acids react with active metals and release hydrogen gas, H2.
Ba(s) + H2SO4(aq) BaSO4(s) + H2(g)
Chapter 14Section 1 Properties of Acids and Bases
4. Acids react with bases to produce salts and water.
5. Acids conduct electric current.
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Click below to watch the Visual Concept.
Chapter 14
Properties of Acids
Section 1 Properties of Acids and Bases
•Visual Concept
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Acids, continuedAcid Nomenclature
• A binary acid is an acid that contains only two different elements: hydrogen and one of the more electronegative elements.
• HF, HCl, HBr, and HI
• Binary Acid Nomenclature1. The name of a binary acid begins with the prefix
hydro-.2. The root of the name of the second element
follows this prefix.3. The name then ends with the suffix -ic.
Chapter 14Section 1 Properties of Acids and Bases
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Acids, continuedAcid Nomenclature, continued
Chapter 14Section 1 Properties of Acids and Bases
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Acids, continuedAcid Nomenclature, continued
• An oxyacid is an acid that is a compound of hydrogen, oxygen, and a third element, usually a nonmetal.
• HNO3, H2SO4
• The names of oxyacids follow a pattern.
• The names of their anions are based on the names of the acids.
Chapter 14Section 1 Properties of Acids and Bases
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Acids, continuedAcid Nomenclature, continued
Chapter 14Section 1 Properties of Acids and Bases
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Some Common Industrial Acids
• Sulfuric Acid• Sulfuric acid is the most commonly produced industrial
chemical in the world.
• Nitric Acid
• Phosphoric Acid
• Hydrochloric Acid• Concentrated solutions of hydrochloric acid are commonly
referred to as muriatic acid.
• Acetic Acid• Pure acetic acid is a clear, colorless, and pungent-smelling
liquid known as glacial acetic acid.
Chapter 14Section 1 Properties of Acids and Bases
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Bases
1. Aqueous solutions of bases taste bitter.
2. Bases change the color of acid-base indicators.
3. Dilute aqueous solutions of bases feel slippery.
4. Bases react with acids to produce salts and water.
5. Bases conduct electric current.
Chapter 14Section 1 Properties of Acids and Bases
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Click below to watch the Visual Concept.
Visual Concept
Chapter 14
Properties of Bases
Section 1 Properties of Acids and Bases
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Arrhenius Acids and Bases
• An Arrhenius acid is a chemical compound that increases the concentration of hydrogen ions, H+, in aqueous solution.
• An Arrhenius base is a substance that increases the concentration of hydroxide ions, OH−, in aqueous solution.
Chapter 14Section 1 Properties of Acids and Bases
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Visual Concept
Chapter 14
Arrhenius Acids and Bases
Section 1 Properties of Acids and Bases
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Arrhenius Acids and Bases, continuedAqueous Solutions of Acids
• Arrhenius acids are molecular compounds with ionizable hydrogen atoms.
• Their water solutions are known as aqueous acids.
• All aqueous acids are electrolytes.
Chapter 14Section 1 Properties of Acids and Bases
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Arrhenius Acids and Bases, continuedAqueous Solutions of Acids, continued• Common Aqueous Acids
Chapter 14Section 1 Properties of Acids and Bases
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Arrhenius Acids and Bases, continuedStrength of Acids
• A strong acid is one that ionizes completely in aqueous solution.
• a strong acid is a strong electrolyte
• HClO4, HCl, HNO3
• A weak acid releases few hydrogen ions in aqueous solution.
• hydronium ions, anions, and dissolved acid molecules in aqueous solution
• HCN• Organic acids (—COOH), such as acetic acid
Chapter 14Section 1 Properties of Acids and Bases
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Arrhenius Acids and Bases, continuedAqueous Solutions of Bases
• Most bases are ionic compounds containing metal cations and the hydroxide anion, OH−.
• dissociate in water
s aq + aq2H O –NaOH( ) Na ( ) OH ( )
aq + l aq + aq–3 2 4NH ( ) H O( ) NH ( ) OH ( )
Chapter 14Section 1 Properties of Acids and Bases
• Ammonia, NH3, is molecular • Ammonia produces hydroxide ions when it reacts
with water molecules.
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Arrhenius Acids and Bases, continuedStrength of Bases
• The strength of a base depends on the extent to which the base dissociates.
• Strong bases are strong electrolytes
Chapter 14Section 1 Properties of Acids and Bases
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Visual Concept
Chapter 14
Strength and Weakness of Acids and Bases
Section 1 Properties of Acids and Bases
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Relationship of [H3O+] to [OH–]
Chapter 14Section 1 Properties of Acids and Bases
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Preview
• Lesson Starter• Objectives• Brønsted-Lowry Acids and Bases• Monoprotic and Polyprotic Acids• Lewis Acids and Bases
Chapter 14 Section 2 Acid-Base Theories
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Lesson Starter
• List three terms that describe the person in the photo.
• The person has been described in many different ways, but he or she is still the same person.
• Acids and bases also can be described differently based on the circumstances.
Chapter 14 Section 2 Acid-Base Theories
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Objectives
• Define and recognize Brønsted-Lowry acids and bases.
• Define a Lewis acid and a Lewis base.
• Name compounds that are acids under the Lewis definition but are not acids under the Brønsted-Lowry definition.
Chapter 14 Section 2 Acid-Base Theories
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Brønsted-Lowry Acids and Bases
• A Brønsted-Lowry acid is a molecule or ion that is a proton donor.
• Hydrogen chloride acts as a Brønsted-Lowry acid when it reacts with ammonia.
+ –3 4HCl NH NH Cl
l + aq aq + aq–2 3 4H O( ) NH ( ) NH ( ) OH ( )
Chapter 14 Section 2 Acid-Base Theories
• Water can act as a Brønsted-Lowry acid.
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Brønsted-Lowry Acids and Bases, continued
• A Brønsted-Lowry base is a molecule or ion that is a proton acceptor.
• Ammonia accepts a proton from the hydrochloric acid. It acts as a Brønsted-Lowry base.
+ –3 4HCl NH NH Cl
Chapter 14 Section 2 Acid-Base Theories
• The OH− ion produced in solution by Arrhenius hydroxide bases (NaOH) is the Brønsted-Lowry base.
• The OH− ion can accept a proton
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Brønsted-Lowry Acids and Bases, continued
• In a Brønsted-Lowry acid-base reaction, protons are transferred from one reactant (the acid) to another (the base).
+ –3 4HCl NH NH Cl
Chapter 14 Section 2 Acid-Base Theories
acid base
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Visual Concept
Chapter 14
Brønsted-Lowry Acids and Bases
Section 2 Acid-Base Theories
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Monoprotic and Polyprotic Acids
• A monoprotic acid is an acid that can donate only one proton (hydrogen ion) per molecule.
• HClO4, HCl, HNO3
• only one ionization step
g + l) aq + aq–2 3HCl( ) H O( H O ( ) Cl ( )
Chapter 14 Section 2 Acid-Base Theories
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Monoprotic and Diprotic Acids
Chapter 14 Section 2 Acid-Base Theories
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Monoprotic and Polyprotic Acids, continued
• A polyprotic acid is an acid that can donate more than one proton per molecule.
• H2SO4, H3PO4
• Multiple ionization stepsl + l aq + aq–2 4 2 3 4H SO ( ) H O( ) H O ( ) HSO ( )
aq + l aq + l– 2–4 2 3 4HSO ( ) H O( ) H O ( ) SO ( )
– 2–4 4HSO and SO
Chapter 14 Section 2 Acid-Base Theories
(1)
(2)
• Sulfuric acid solutions contain H3O+,
ions
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Monoprotic and Polyprotic Acids, continued
• A diprotic acid is the type of polyprotic acid that can donate two protons per molecule
• H2SO4
• A triprotic acid is the type of polyprotic acid that can donate three protons per molecule.
• H3PO4
Chapter 14 Section 2 Acid-Base Theories
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Visual Concept
Chapter 14
Comparing Monoprotic and Polyprotic Acids
Section 2 Acid-Base Theories
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Lewis Acids and Bases
• A Lewis acid is an atom, ion, or molecule that accepts an electron pair to form a covalent bond.
• The Lewis definition is the broadest of the three acid definitions.
• A bare proton (hydrogen ion) is a Lewis acid
aq + aq aq aq3 3 4H ( ) : NH ( ) [H — NH ] ( ) or [NH ] ( )
Chapter 14 Section 2 Acid-Base Theories
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Lewis Acids and Bases, continued
• The formula for a Lewis acid need not include hydrogen.
• The silver ion can be a Lewis acid
aq + aq aq 3 3 3 3 2Ag ( ) 2 : NH ( ) [H N — Ag — NH ] ( ) or [Ag(NH ) ]
aq aq aq– –3 4BF ( ) F ( ) BF ( )
Chapter 14 Section 2 Acid-Base Theories
• Any compound in which the central atom has three valence electrons and forms three covalent bonds can react as a Lewis acid.
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Visual Concept
Chapter 14
Lewis Acids and Bases
Section 2 Acid-Base Theories
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Lewis Acids and Bases, continuedAcid Base Definitions
Chapter 14 Section 2 Acid-Base Theories
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Visual Concept
Chapter 14
Comparing Arrhenius, Brønsted-Lowry, and Lewis Acids and Bases
Section 2 Acid-Base Theories
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Preview
• Lesson Starter• Objectives• Conjugate Acids and Bases• Amphoteric Compounds• Neutralization Reactions• Acid Rain
Chapter 14 Section 3 Acid-Base Reactions
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Lesson Starter
• What is the meaning of the word neutralization.
• How is the word used in everyday life?
• How is it likely to apply to acids and bases?
Chapter 14 Section 3 Acid-Base Reactions
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Objectives
• Describe a conjugate acid, a conjugate base, and an amphoteric compound.
• Explain the process of neutralization.
• Define acid rain, give examples of compounds that can cause acid rain, and describe effects of acid rain.
Chapter 14 Section 3 Acid-Base Reactions
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Conjugate Acids and Bases
• The species that remains after a Brønsted-Lowry acid has given up a proton is the conjugate base of that acid.
aq + l aq + aq–2 3HF( ) H O( ) F ( ) H O ( )
Chapter 14 Section 3 Acid-Base Reactions
acid conjugate base
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Conjugate Acids and Bases, continued
• Brønsted-Lowry acid-base reactions involve two acid-base pairs, known a conjugate acid-base pairs.
aq + l aq + aq–2 3HF( ) H O( ) F ( ) H O ( )
Chapter 14 Section 3 Acid-Base Reactions
acid1 base2 base1 acid2
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Neutralization Reactions
Chapter 14 Section 3 Acid-Base Reactions
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Conjugate Acids and Bases, continuedStrength of Conjugate Acids and Bases
• The stronger an acid is, the weaker its conjugate base
• The stronger a base is, the weaker its conjugate acid
g + l aq + aq–2 3HCl( ) H O( ) H O ( ) Cl ( )
Chapter 14 Section 3 Acid-Base Reactions
strong acid base acid weak base
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Conjugate Acids and Bases, continuedStrength of Conjugate Acids and Bases, continued
• Proton transfer reactions favor the production of the weaker acid and the weaker base.
aq + l aq + aq–4 2 3 4HClO ( ) H O( ) H O ( ) ClO ( )
aq + l aq + aq–3 2 3 3CH COOH( ) H O( ) H O ( ) CH COO ( )
Chapter 14 Section 3 Acid-Base Reactions
stronger acid stronger base weaker acid weaker base
• The reaction to the right is more favorable
weaker acid weaker base stronger acid stronger base
• The reaction to the left is more favorable
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Visual Concept
Chapter 14
Conjugated Acids and Bases
Section 3 Acid-Base Reactions
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Relative Strengths of Acids and Bases
Chapter 14 Section 3 Acid-Base Reactions
Relative Strengths of Acids and Bases
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Amphoteric Compounds
• Any species that can react as either an acid or a base is described as amphoteric.
• example: water• water can act as a base
aq + l aq + aq–2 4 2 3 4H SO ( ) H O( ) H O ( ) HSO ( )
g + l aq aq–3 2 4NH ( ) H O( ) NH ( ) OH ( )
Chapter 14 Section 3 Acid-Base Reactions
acid1 base2 acid2 base1
• water can act as an acid base1 acid2 acid1 base2
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Amphoteric Compounds, continued–OH in a Molecule
• The covalently bonded IOH group in an acid is referred to as a hydroxyl group.
• Molecular compounds containing —OH groups can be acidic or amphoteric.
• The behavior of a compound is affected by the number of oxygen atoms bonded to the atom connected to the —OH group.
Chapter 14 Section 3 Acid-Base Reactions
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Oxyacids of Chlorine
Chapter 14 Section 3 Acid-Base Reactions
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Click below to watch the Visual Concept.
Visual Concept
Chapter 14
Amphoterism
Section 3 Acid-Base Reactions
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Neutralization ReactionsStrong Acid-Strong Base Neutralization
• In aqueous solutions, neutralization is the reaction of hydronium ions and hydroxide ions to form water molecules.
• A salt is an ionic compound composed of a cation from a base and an anion from an acid.
2aq + aq aq lHCl( ) NaOH( ) NaCl( ) H O( )
Chapter 14 Section 3 Acid-Base Reactions
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Click below to watch the Visual Concept.
Visual Concept
Chapter 14
Neutralization Reaction
Section 3 Acid-Base Reactions
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Acid Rain
• NO, NO2, CO2, SO2, and SO3 gases from industrial processes can dissolve in atmospheric water to produce acidic solutions.
g + l aq3 2 2 4SO ( ) H O( ) H SO ( )
Chapter 14 Section 3 Acid-Base Reactions
• example:
• Very acidic rain is known as acid rain.
• Acid rain can erode statues and affect ecosystems.
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Visual Concepts
Acid Precipitation
Chapter 14
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End of Chapter 14 Show