chapter 4 aqueous reactions and solution stoichiometry
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Chemistry, The Central Science , 10th edition Theodore L. Brown; H. Eugene LeMay, Jr.; and Bruce E. Bursten. Chapter 4 Aqueous Reactions and Solution Stoichiometry. John D. Bookstaver St. Charles Community College St. Peters, MO 2006, Prentice Hall, Inc. Solutions:. - PowerPoint PPT PresentationTRANSCRIPT
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AqueousReactions
Chapter 4Aqueous Reactions and Solution Stoichiometry
John D. Bookstaver
St. Charles Community College
St. Peters, MO
2006, Prentice Hall, Inc.
Chemistry, The Central Science, 10th editionTheodore L. Brown; H. Eugene LeMay, Jr.;
and Bruce E. Bursten
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Solutions:
• Homogeneous mixtures of two or more pure substances.
• The solvent is present in greatest abundance.
• All other substances are solutes.
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Dissociation
• When an ionic substance dissolves in water, the solvent pulls the individual ions from the crystal and solvates them.
• This process is called dissociation.
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Electrolytes
• Substances that dissociate into ions when dissolved in water.
• A nonelectrolyte may dissolve in water, but it does not dissociate into ions when it does so.
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Electrolytes and Nonelectrolytes
Soluble ionic compounds tend to be electrolytes.
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Electrolytes and Nonelectrolytes
Molecular compounds tend to be nonelectrolytes, except for acids and bases.
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Electrolytes
• A strong electrolyte dissociates completely when dissolved in water.
• A weak electrolyte only dissociates partially when dissolved in water.
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Strong Electrolytes Are…
• Strong acids
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Strong Electrolytes Are…
• Strong acids• Strong bases
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Strong Electrolytes Are…
• Strong acids• Strong bases• Soluble ionic salts
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Precipitation Reactions
When one mixes ions that form compounds that are insoluble (as could be predicted by the solubility guidelines), a precipitate is formed.
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Metathesis (Exchange) Reactions• Metathesis comes from a Greek word that
means “to transpose”
AgNO3 (aq) + KCl (aq) AgCl (s) + KNO3 (aq)
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Metathesis (Exchange) Reactions• Metathesis comes from a Greek word that
means “to transpose”• It appears the ions in the reactant
compounds exchange, or transpose, ions
AgNO3 (aq) + KCl (aq) AgCl (s) + KNO3 (aq)
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Metathesis (Exchange) Reactions• Metathesis comes from a Greek word that
means “to transpose”• It appears the ions in the reactant
compounds exchange, or transpose, ions
AgNO3 (aq) + KCl (aq) AgCl (s) + KNO3 (aq)
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Solution Chemistry
• It is helpful to pay attention to exactly what species are present in a reaction mixture (i.e., solid, liquid, gas, aqueous solution).
• If we are to understand reactivity, we must be aware of just what is changing during the course of a reaction.
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Molecular Equation
The molecular equation lists the reactants and products in their molecular form.
AgNO3 (aq) + KCl (aq) AgCl (s) + KNO3 (aq)
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Ionic Equation• In the ionic equation all strong electrolytes (strong
acids, strong bases, and soluble ionic salts) are dissociated into their ions.
• This more accurately reflects the species that are found in the reaction mixture.
Ag+ (aq) + NO3- (aq) + K+ (aq) + Cl- (aq)
AgCl (s) + K+ (aq) + NO3- (aq)
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Net Ionic Equation• To form the net ionic equation, cross out anything
that does not change from the left side of the equation to the right.
Ag+(aq) + NO3-(aq) + K+(aq) + Cl-(aq)
AgCl (s) + K+(aq) + NO3-(aq)
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Net Ionic Equation• To form the net ionic equation, cross out anything
that does not change from the left side of the equation to the right.
• The only things left in the equation are those things that change (i.e., react) during the course of the reaction.
Ag+(aq) + Cl-(aq) AgCl (s)
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Net Ionic Equation• To form the net ionic equation, cross out anything
that does not change from the left side of the equation to the right.
• The only things left in the equation are those things that change (i.e., react) during the course of the reaction.
• Those things that didn’t change (and were deleted from the net ionic equation) are called spectator ions.
Ag+(aq) + NO3-(aq) + K+
(aq) + Cl-(aq)
AgCl (s) + K+(aq) + NO3-(aq)
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Writing Net Ionic Equations
1. Write a balanced molecular equation.
2. Dissociate all strong electrolytes.
3. Cross out anything that remains unchanged from the left side to the right side of the equation.
4. Write the net ionic equation with the species that remain.
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Writing Net Ionic Equations
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Acids:
• Substances that increase the concentration of H+ when dissolved in water (Arrhenius).
• Proton donors (Brønsted–Lowry).
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Acids
There are only seven strong acids:• Hydrochloric (HCl)• Hydrobromic (HBr)• Hydroiodic (HI)
• Nitric (HNO3)
• Sulfuric (H2SO4)
• Chloric (HClO3)
• Perchloric (HClO4)
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Bases:
• Substances that increase the concentration of OH− when dissolved in water (Arrhenius).
• Proton acceptors (Brønsted–Lowry).
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Bases
The strong bases are the soluble salts of hydroxide ion:• Alkali metals• Calcium• Strontium• Barium
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Acid-Base Reactions
In an acid-base reaction, the acid donates a proton (H+) to the base.
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Neutralization ReactionsGenerally, when solutions of an acid and a base are combined, the products are a salt and water.
HCl (aq) + NaOH (aq) NaCl (aq) + H2O (l)
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Neutralization ReactionsWhen a strong acid reacts with a strong base, the net
ionic equation is…
HCl (aq) + NaOH (aq) NaCl (aq) + H2O (l)
H+ (aq) + Cl- (aq) + Na+ (aq) + OH-(aq)
Na+ (aq) + Cl- (aq) + H2O (l)
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Neutralization ReactionsWhen a strong acid reacts with a strong base, the net
ionic equation is…
HCl (aq) + NaOH (aq) NaCl (aq) + H2O (l)
H+ (aq) + Cl- (aq) + Na+ (aq) + OH-(aq)
Na+ (aq) + Cl- (aq) + H2O (l)
H+ (aq) + Cl- (aq) + Na+ (aq) + OH- (aq) Na+ (aq) + Cl- (aq) + H2O (l)
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Neutralization Reactions
Observe the reaction between Milk of Magnesia, Mg(OH)2, and HCl.
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Gas-Forming Reactions
• These metathesis reactions do not give the product expected.
• The expected product decomposes to give a gaseous product (CO2 or SO2).
CaCO3 (s) + HCl (aq) CaCl2 (aq) + CO2 (g) + H2O (l)
NaHCO3 (aq) + HBr (aq) NaBr (aq) + CO2 (g) + H2O (l)
SrSO3 (s) + 2 HI (aq) SrI2 (aq) + SO2 (g) + H2O (l)
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Gas-Forming Reactions
• This reaction gives the predicted product, but you had better carry it out in the hood, or you will be very unpopular!
• Just as in the previous examples, a gas is formed as a product of this reaction:
Na2S (aq) + H2SO4 (aq) Na2SO4 (aq) + H2S (g)
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Oxidation-Reduction Reactions
• An oxidation occurs when an atom or ion loses electrons.
• A reduction occurs when an atom or ion gains electrons.
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Oxidation-Reduction Reactions
One cannot occur without the other.
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Oxidation Numbers
To determine if an oxidation-reduction reaction has occurred, we assign an oxidation number to each element in a neutral compound or charged entity.
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Oxidation Numbers
• Elements in their elemental form have an oxidation number of 0.
• The oxidation number of a monatomic ion is the same as its charge.
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Oxidation Numbers
• Nonmetals tend to have negative oxidation numbers, although some are positive in certain compounds or ions.Oxygen has an oxidation number of −2,
except in the peroxide ion in which it has an oxidation number of −1.
Hydrogen is −1 when bonded to a metal, +1 when bonded to a nonmetal.
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Oxidation Numbers
• Nonmetals tend to have negative oxidation numbers, although some are positive in certain compounds or ions.Fluorine always has an oxidation number
of −1.The other halogens have an oxidation
number of −1 when they are negative; they can have positive oxidation numbers, however, most notably in oxyanions.
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Oxidation Numbers
• The sum of the oxidation numbers in a neutral compound is 0.
• The sum of the oxidation numbers in a polyatomic ion is the charge on the ion.
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Oxidation Numbers
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Displacement Reactions
• In displacement reactions, ions oxidize an element.
• The ions, then, are reduced.
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Displacement Reactions
In this reaction,
silver ions oxidize
copper metal.
Cu (s) + 2 Ag+ (aq) Cu2+ (aq) + 2 Ag (s)
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Displacement Reactions
The reverse reaction,
however, does not
occur.
Cu2+ (aq) + 2 Ag (s) Cu (s) + 2 Ag+ (aq) x
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Activity Series
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Writing molecular and net ionic equations for redox reactions
• Write the balanced molecular and net ionic equations for the reaction of aluminum with hydrobromic acid.
• Remember that metals above H on the activity series react with acids to form salts and H2 gas
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2Al(s) + 6HBr(aq) 2AlBr3(aq) + 3H2(g)
2Al(s) + 6H+(aq) 2Al+3 + 3H2(g)
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• Write the balanced molecular and net ionic equations for the reaction between magnesium and cobalt(II) sulfate
• What is oxidized and what is reduced?
• Check your answer Pg. 142 Practice exercise
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Which is more easily reduced?
• Mg+2(aq) or Ni+2 (aq)
• Ni+2(aq)
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• Will an aqueous solution of iron II chloride oxidize magnesium metal?
• If so, write the net ionic equation
• Check answer on Pg. 144 Sample exercise
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• Which of the following metals will be oxidized by Pb(NO3)2
• Zn, Cu, Fe
• Answer = Zn and Fe
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Molarity• Two solutions can contain the same
compounds but be quite different because the proportions of those compounds are different.
• Molarity is one way to measure the concentration of a solution.
moles of solute
volume of solution in litersMolarity (M) =
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Mixing a Solution
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Dilution
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Solution Stoichiometry and Chemical Analysis
• Involves calculations that relate moles of reactants and products to the volumes of solutions and their molar concentrations
• Can use a “mole map”
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Using Molarities inStoichiometric Calculations
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Sample problem
• How many grams of solid sodium carbonate are in a sample if it takes 30.5 mL of 0.254 M hydrochloric acid to completely react with the sample?
• First write and balance the equation for the reaction
• Answer on transparency
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Titration
• Is an analytical technique used to determine the unknown concentration of a solution by reacting it with a solution of known concentration called a standard solution
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Equivalence Point
• The Equivalence Point of a titration is the point at which the moles of substance dissolved in the unknown solution completely react with the moles of substance in the standard solution
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End Point
• End point is the point at which an indicator changes color.
• The end point is designed to coincide as closely as possible to the equivalence point
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TitrationThe analytical technique in which one can calculate the concentration of a solute in a solution.
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Titration
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• Sample problem on handout
• Solution on overhead