Class Note for CHEM 112 at UMass(50)
Class Note for CHEM 112 at UMass(50)
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This 12 page Class Notes was uploaded by an elite notetaker on Friday February 6, 2015. The Class Notes belongs to a course at University of Massachusetts taught by a professor in Fall. Since its upload, it has received 16 views.
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Date Created: 02/06/15
Turn on Camtasia Recording QM 5er To prepare study notes read chapts 17 and 18 and make sure you can do OWL problems without the help 7 You can repeat OWLs without loosing credit Office hours Thurs 2345 pm in LGRT1021G K amp may H undo NEW an wad air M 42quot AA t lr Yaw ff 0 S a and an 3 Nd E d 9 5 1 39 v I 9 f th VEPZWI whim 2 re n Benzoic acid m 9W9 m N ao H mam Vamme mo 7 Exactly 7 What is the pH at the equivalence point for titrating 01 M HCI with 02 M BaOH A Less than 7 BAmost 7 D Greater than 7 E Can not be determined from information given traunnmeakerl E MWeA quL39Blsc oH Maul Volume of titrating reagent added gt QUESTION You titrate 100 mL of a 0025 M solution of benzoic acid with 0100 M NaOH to the equivalence point pH at pH at halfway equivalence 397 point a 397 point V 1 V 7 pH of solution of 4 benzoic acid a weak acid BenZOIc aCIdM Na OH 5 OUESTlON You liliale 100 mLola h 0025Msolution albenzolc acid with 0100MNaDleheequwalence paint I 03 PH at 7 equivalence 4 point point 1 I 74 pH of solution of K3 may 2 benzoicacidaweak Benzolc acid and u NaOH I H37 y 140131430 31 lquot I 0015 V C 44 H 00 000 6 0016 a I 00013 4 TH 181 6 ll 1 3x10 FL 123 la 4 L 41mm 4 mm m mu nmsmmmmakuxmwm n mMNnmamemmmwm WM W Pqu V quot Holsnuunl M L ma my E Lr K mu H304 1175 W a a quotff 3 E nous 1 L x cam yy H 151 a d ehu wdma 3h 9 W m ms t 7v e mm 1 x r W m mam a umlm Fr 3mmbuamfvj SW Q QIKtAl WUWK 9 0025w 0 L x d 12 quotW W Y oozSLNUOH I 13026 an 7 0 quot1 LOH nab oLHBz 1 L W 0 MWME 9 WW 1 Yeah HE NH 7quot H 5 51 Kb mo L 1 M3231 0 ms momma MA 40 BI h wank el wxulmu 1 AM Dvoozgmnl NW 000251 dam 001 L xbmo 39 H 5 MW Jmm a 0 l L Hh omeL NLW 75 t 90075M39 3quot a 002 Bi ole L M M nm 35 Kb Kg XKb 5 KIFIW mu 025mwwuu 1 I nwmm mst H mm n u HanzuuWiumL m Lemw 100szva 82 5 001M E 0415 L aw vcmm emu d A W 13139 H 0 4 0H 002M 2 a r H K1quot c 1 CW 6 0011 1 C W Vq39 M 00 1 my Wk um Bz MHO 3 0H H132 b 9433 D 0 E L1 32 Jrr gtlt Z 2 e on X gtlt 1 14 x10 2 L usc assumishuv 002 gt H 1 3 vs 0quot a W f w CW3 U45 4 1 11 639 7L Kmoo 0005 x mm A 47H 12 wmmm m a l s was A FL iAj a Puuemsis w Jaime 4 L Holsnu on I M K5 53101522 klsz Banzuic amu NaOH H31 4 mu H304 1 375 Law a a 0 C39 quotff w man one 6 Dom 1 7 l x cam v H 191 Barium Sulfate mumRIM K5p 11x1o10 7C sdubil39 a 82604 is a b BaSO4 is opaque to common mineral xrays Drinking a appearing a white BaSO4 cocktail POWder 0r COIOFIeSS enables a physician cryStals to exam the intestines Biominerals 1 Bone amp Teeth Calcium Hydroxyapatite CasrPoozCaromz 2 Sea Shells Aragonite CaCOs 3 Otoliths CaCOs 4 Magnetite Fe304 particles in magnetotactic bacteria turn it so Magnelnspirilurn magneruraqrrum Conch Shell Aragonite one crystal form of CaCOa15 K5 is l0 An equilibrium constant that describes just exactly how insoluble an insoluble salt is I uan be used to predict When a precipitation reaction will occur Remember that when QKSp the system is at equilibrium QgtKSp reaction will shift toward precipitate QltKSp more compound will dissolve because the solution is not saturated 16 Ag Pio2 ngz 3 Insoluble Salts AgCl PioCi2 ngm2 Although all these salts are said to be insoluble they do dissolve to some SLIGHT extent M AJCKS H Agaq C39aq When equilibrium has been established no more AgCI dissolves and the solution is 17 Ag Pio2 ngzquot AgCl PioCi2 ngmz AQCSltgtAgaQ C39aQ When solution is SATU RATED expt shows that Ag 167 x105 M This is equivalent to the SOLUBILITY of AgCI What is CI39 18 Some Values of KSp Table 182 Some Common Insoluble Compounds and Thequot K Valuesquot Formula Name KS 25 Q common NamesUses tacog Calcium carbonate 34 x 10 Calcite icetano soar Mncoa Manganeseat carbonate 23 X 10 Rho orlimsite toms insermlmed Ciystals Fem Ironal carbonate 31 x 10 Sioerito an Calcium fluoride 53 X w Fluorite suuice of HF and otnor inorganic fluorides AgCl Silver cntorioo 1x X 10quotquot cntovargyrito AgEr Silver orornioo 54 X 10 Used in pnotograpnic film Castk Calcium sulfate 49 x 1o S Tno nyorateo form is commonly called gypsum Basel Barium sulfate 11 gtlt 10quotquot Baritc used in drilling mudquot and as a component or paints Srsot Strontium sulfate 34 X 10 7 Celestite taming Calcium nyoroxioo 55 x 10 3 staked lime VThc value m um mhle watt mlwn lmm mum s mom mommy mt EtlNei1rkh tchtlnuwHillPublhlwiw mu Azldiumml Kw values me gncn m lppvndn i Can only compare KSp when for salts that have the same cation anion ratio 19 Some solubility guidelines useful but not necessary to memorize 1 00 All sodium potassium and ammonium salts are soluble All nitrates acetates and perchlorates are soluble All silver lead and mercuryl salts are insoluble All chlorides bromides and iodides are soluble except silver lead and mercuryl halides All carbonates sulfides oxides and hydroxides are insoluble All sulfates are soluble except calcium sulfate and barium sulfate 20 Precipitatinq on Insoluble Salt ngCI2s 6 H922aq 2 CIaq Ksp 11 x 1018 H3922 CI2 KSID product of moxnmum Ion COhCS Precip begins when product of ion concs EXCEEDS the Ksp 21 The Common Ion Effect Calculate the solubility of BaSO4 in a pure waterand b in 0010 M BaNOs2 BaSO4s lt gt Ba2aq SO4239aq KSP for BaSO4 11 X 103910 Executive SUMMARY Solubility in pure water X 11 X 10395 M Solubility in presence of added Ba2 11 X 10398 M Le Chatelier s Principle is followed 22 An aqueous solution contains 0320 M ammonia Calculate the pH of the solution after the addition of 500x10392 moles of hydrobromic acid to 225 mL of this solution Assume that the volume does not change upon adding HBr acid 23
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