Chemical Reactions: Putting it all TogetherChemical Reactions: Putting it all TogetherTitrationTitration ExamplePractice ProblemTitration DemoComplexation ReactionsComplexation ReactionsReview Problem: Percent YieldPractice with ReactionsPractice with ReactionsPractice with ReactionsPractice with ReactionsReview ProblemReview ProblemWhat You Should KnowChemical Reactions:Putting it all TogetherCH110 FA11 SAS 1Did you miss an exam?Download Make Up Request and make an appointment to see me!Prepare for Recitation December 1stALEKS Objective 13 due November 29thANGEL Quiz 13, December 1stLecture 37: November 16thLecture 38: November 18th(Thanksgiving Break)Lecture 39: November 28thRead: Ch. 4.6,10.5 (Reactions); 5.3 – 5.7, 8.8 (Thermo)Additional Preparation: Packet Rxns: 12-18BLB 10: 57BLB 5: 4,17,29,37,39, 53,55,83,85; Packet 5: 1-7BLB 8: 65a,67ac,92a; 18: 72ab,74; Packet 8: 12-14CH110 FA11 SAS 2By the end of Today’s Lecture you should know:TitrationsExchange Reactions (Metathesis)Redox ReactionsNet ionic equations and balanced molecular equationsKEY QUESTIONS: THE BIG PICTUREChemical Reactions:Putting it all TogetherHow do you determine the outcome of a chemical reaction?How can I figure out how much of a reactant I have if I do not know?Remember: Chemistry deals with matter and its changesWhat does the equivalence point of a titration tell us about unknown concentrations of reactants?What forces drive metathesis reactions to occur spontaneously?What forces drive oxidation-reduction reactions to occur spontaneously?TitrationCH110 FA11 SAS 3• React solution of known concentration (______________) with solution of unknown concentration• Find equivalence point (_______)Goal:Method:Example:soln. of unknown NaOHconcentrationadd std. soln. of known HCl concentrationFind volume at equivalence point(need way to signal the equiv. pointsuch as indicator)Titration ExampleCH110 FA11 SAS 4A flask contains an unknown amount of HCl.This solution is titrated with 0.101 M NaOH.It takes 23.35 mL of NaOH to complete thereaction. How many grams of HCl were there?HCl + NaOH → NaCl + H2O(1) Find moles of NaOH used(2) Find moles of HCl(3) Find g of HClIf we knew the volume of HCl solution, we couldcalculate the M of the HCl solution.Practice ProblemCH110 FA11 SAS 525.0 mL of 0.100 M acetic acid solution is titrated with 0.200 M NaOH solution. How many mL of the NaOH solution are required to reach the equivalence point?A) 6.25 mLB) 12.5 mLC) 25.0 mLD) 50.0 mLE) Cannot answer, acetic acid is a weak acidTitration DemoCH110 FA11 SAS 6How much 0.1 M NaOH will be required to titrate ____ mL of 0.1M H2SO4?(1) Find moles of NaOH used(2) Find moles of H+H2SO4+ 2 NaOH → Na2SO4+ 2 H2OInspecting the balanced equation:we predict __ mL of NaOH per 1 mL H2SO4How many moles of H+were neutralized?Complexation ReactionsCH110 FA11 SAS 7Related to Acid-Base Reactions• _____ cation acts similarly to an acid • Electron-rich molecule or anion (ligand) acts similarly to a base• Metal + ligand forms a complexAg(NO3) + 2NH3→ [Ag(NH3)2]+(aq) + NO3-(aq)Net ionic Equation:Complexation ReactionsCH110 FA11 SAS 8ethylenediamine(“en”)Chelating Ligands:• Ex:EDTA and ethylenediamine (“en”) shown below:[Cu(H2O)2(NH3)2]2+[Cu(H2O)2(en)2]2+What is the net ionic equation for this ethylene diamine complexation?CuCl2(aq) + 2 en (aq) → Cu(en)2Cl2(aq)Review Problem: Percent YieldCH110 FA11 SAS 9To make SiCl4, a scientist combines 75 g each of SiO2, C, and Cl2, which react as:SiO2(s) + C(s) + Cl2(g) →SiCl4(s) + CO(g)If 8.34 g of SiCl4is produced, what is the % yield of the reaction?Practice with ReactionsCH110 FA11 SAS 10Predict the products of this reaction:Name the type of reaction:Give the complete ionic or molecular equation:If ionic, provide the net ionic equation:NH4OH(aq) + HClO4 (aq) →Practice with ReactionsCH110 FA11 SAS 11Predict the products of this reaction:Name the type of reaction:Give the complete ionic or molecular equation:If ionic, provide the net ionic equation:BaCl2(aq) + Na3PO4 (aq) →Practice with ReactionsCH110 FA11 SAS 12Predict the products of this reaction:Name the type of reaction:Give the complete ionic or molecular equation:If ionic, provide the net ionic equation:AI(s) + Fe(NO3)2 (aq) →Practice with ReactionsCH110 FA11 SAS 13Predict the products of this reaction:Name the type of reaction:Give the complete ionic or molecular equation:If ionic, provide the net ionic equation:C5H6O(l) + O2 (g) →Review ProblemCH110 FA11 SAS 14What is the driving force for the reaction between NaOH and H2SO4?A) Formation of a precipitateB) Formation of a weak or nonelectrolyte(neutralization)C) Formation of a gasD) No reaction occurs, so no driving forceE) I didn’t remember that concept…Review ProblemCH110 FA11 SAS 15What are the spectator ions when KCl and NaNO3react?A) Na+(aq) and Cl-(aq)B) Na+(aq) and NO3-(aq)C) K+(aq) and Cl-(aq)D) Na+(aq), K+(aq), and Cl-(aq)E) K+(aq), Na+(aq), Cl-(aq), and NO3-(aq) (meaning no reaction occurs)What You Should Know CH110 FA11 SAS 16Titrations• What is a standard solution?• How does a titration allow us to determine the unknown concentration of a reactant?• What is the equivalence point of a titration?• What is an indicator?Metathesis Reactions• What forces drive metathesis reactions?• How do net ionic equations help describe some metathesis reactions?• What is a spectator ion?Redox Reactions• What is an oxidizing agent? A reducing agent?• What must be balanced in an oxidation reduction reaction?• How do oxidation numbers help us to balance redox
View Full Document
Unlocking...