CHEM 210 Lecture 6: SN2 & Strong Acid EA, energy diagrams, thermodynamics and kinetics

e For The | X1 e Alabame >( e Alabama × \ e Alabama × \ e Alabama × \ e Alabame New Tab ← d ⓘ www.saplinglearning.com/ibiscms/mod/ibis/view.php?id=4589196 Sapling Learning macmilan learming 辮 Apps Scholarship Award f- 廿 Scholarship Opportu "Hit the Books" Scho Attempts Scoe 3/6/2018 11:59 PM。75/100 Gradebook O Assignment Information ーPrint -Calculator -4 Periodic Table Question 17 of 20 Available From: 3/2/2018 11:00 AM Due Date: Points Possible: 100 Grade Category: Quiz 4 Description: Policies: You can check your answers. You can view solutions after the due date. You have three attempts per question There is no penalty for incorrect answers. Mapd 3/6/2018 11:59 PM Sapling Learning Classify each titration curve as representing a strong acid titrated with a strong base, a strong base titrated with a strong acid, a weak acid titrated with a strong base, a weak base titrated with a strong acid, or a polyprotic acid titrated with a strong base Strong acid strong base strong base Weak acid strong base Weak bas Polyprotic acid strong acid Quiz strong acid strong base 12 2 13 1 14 1 15 3 16 2 17 0 18 3 19 2 O eTextbook O Help With This Topic Web Help & Videos mL of itrant mL of btrant mL of titrant mL oftitrant mL of titrant O Technical Support and Bug Reports O Previous " Check Answer Next Exit O Type here to search 8-36 PM ^目脈3/5/2018

.ill AT&T 9:44 AM Back Chem1B-W18-Homework5.pdf [1] This homework assignment郷due at the begining of class on March 9., 2018, write your answers on a separate piece of paper, and show your work to receive credt Protiem 1 What distinguishes a strong acid from a weak acid7 What distinguishes a strong base from a weak base? Write out examples of the proton-transfer reaction for each as well as the equilibrium expression (K or Ko) tor each ? Wrtie equations Probiem 2 In class we dscussed e autoionization of water, What is an for the autoionization reactions for H-O and H SO Assume that both are pure iquids Problem 3 In class on Friday, we calculated the [HO-1 and [OH in stomach acid at pH 1.5 The average volume of an adult human stomach is 1L. How many H0 ions are present in a human stomach i&the pH is 2.0? How many OH- ions? man body temperatre). Problem4 any equlbnum constant. Min changes with temperature. At 37 ℃ the pH of waner is 6.80. Caloulate the following for pure water at this temperature: b) IOH1 Problems whais a con ate acid-base pair? What is the relationship between the two members of pair? Prettem.6 Draw a Lewis structure ot each of thy tolowing acids. Then, wte balanced aciddssociaton reactions and equibrium expressions for each in water. a) Formic acid, HCOOH b) Chloric acid, HCIO, c) Dihydrogen arsenate, H As0 Probiem Z Dihydrogen arsenate is an ampiprotie substance, meaning tcan both accept and donane a proton Draw Lewis structures of the conjugate acid and the conjugate base of dihydrogen arsenate. Write the balanced base-dissociation reaction and equiibrium expression of dihydrogen arsenate in water Paatina successivo K.'s for polyprotic acids decrease. For thé polyproc phosphoric acid. HAo, K., 7.2 x10. KA6.3 x 10, Ka 4.2 x 10- Draw Lewis structures of each of the species involwed in each acid- dissociation roacton、Why d0the K.'s decrease for each successi e deprotaraton? Protiem 2 Hypochionous acid, HCIO, has a pka ol 7.54. What are the [Hs0-]. pH. [CO1 and [HCIO] in a 0.115 M solution of HCI0? Problema in a 0 735 M solution a weak acid is 12 5% dssoc ated. a) Calculatemo-1, pH·[OH 1, and pH of the solution. b) Calculate Ka of the acid Problemi! Acetyisaleyic acid (asprin, structure shown to the right). HC此:O4, is the most widely used pain reliever and tever reducer. Find the pH of 0.018 M aqueous aspirin at body temperature (K.: 3.6 x 104 at 37°C). Problem12 why郷aqueous NaF basic but aqueous NaCl neutral? Chit consider the reaction of each anion with water 1 of 1 Previous Dashboard Calendar To Do Notifications Inbox

together as the initial solution, what will be the initial concentration of SCN (aq)? 8. According to the equation Fe"(aq) + SCN(aq)与[Fe(SCN)12"(ag), lf 1.0 mL of 0.002 M Fe3 (aq), 1.0 mL 0.002 M SCN-(aq) and 8.0 mL of H20 are mixed together as the initial solution, what will be the initial concentration of [Fe(SCN)]2+ (aq)? 9. In the calibration part of the experiment (Part 1), the reactants are combined with one as a limiting reagent. According to the equation Fe (aq) +SCN(aq)[Fe(SCN)12+(aq), if 1.0 m of 0.2 M Fe3 (aq), 1.0 mL 0.002 M SCN-(aq) and 69.0 mL of H20 are mixed together as the initial solution, what will be the equilibrium concentration of Fe3 (aq)? 10. In the calibration part of the experiment (Part 1), the reactants are combined with one as a limiting reagent. According to the equation Fe"(aq) + SCN(aq) = [Fe(SCN)]"(aa), if 1.0 mL of 0.2 M Fe3 (aq), 1.0 mL 0.002 M SCN (aq) and 69.0 mL of H2O are mixed together as the initial solution, what will be the equilibrium concentration of SCN(aq)? Safety Nitric acid, HNOs, is a strong acid. Wash all splashes and spills with copious quantities of water Procedure solutions Part 1: Calibration curve using standard Fe(SCN 1. Prepare solutions A-1 through A-6 using the instructions below. The instructor may divide t of chemicals used. Check with the instructor which solutions to make before you begin. Note that the concentration of the Fe solution used in this step is 0.100 M - make sure you class into groups, each group preparing 50 mL of one or two A solutions to minimize the am