Exam 2 p1 - CHEM 113 NAME(LAST(First Show all calculations...

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Unformatted text preview: CHEM 113 3/8/2006 NAME (LAST) (First) Show all calculations, and include units where applicable. (Total points ~ 80 , to be normalized to 100) 1. (a) 4 points. Use the following K3 information to determine the strength of the acid. C2H403+ ~ 1 x 107 CHC13 ~ 1 x 10'26 NH4C1 = 5.6 x 10'10 strong C ‘2.” a 3 weak Ki H3; 08 very weak CHQ; Which acid is stronger than water but weaker than the hydronium ion, H30+ ? N H” ge Which acid is 100% dissociated in water (degraded to H3O+ )? Cl” 3 03+ (b) What is the strongest acid that can exist in water? H go (i The strongest base? *5 H 2. 4 points. Calculate the pH of the following solutions of HCl in water. (Is HCl a strong acid or a weak acid? What is the autoionization constant of water at 25°C and what is the equilibrium expression for it?) (a)0.10MHC1 EM». 0.10 L4 (b)1.0x10'“MHCl Mason (hawks) «43 Put—.2704» +4, “no Van... we W Ham ace EM: (fig 4‘» (0' a : 10"»; ; pH :7 3. 2 points. Arrange the following fi'om the strongest to the weakest base. H20, N03', NH3 strongest NH; weakest M25- 4. 6 points. (a) What are the major species present in a 0.250 M solution of HNOz (Ka = 4.0 x 104)? (b) Calculate the pH of this solution. First write the equation for the acid dissociation reaction. ”N07. + H10 "'2 “30+ 4“ ”0; K‘Jsfliquz firfimmd’i . . . -7 c ' - “Us ~/— Ckaef' x :K ig- 455mm: ’1“ 061.50) ' 0.750 93,“:le also—7c (75+(d' )Mac K g‘ . . g» A _ Milt) c ‘ “Hing ‘gfives M201010§L 4 uie. fragcmoc: ttncA 4 SZ so My}! EH+3=K=0,O;0 fl , PH:1,¢© (c) What are the major species present in a solution containing both 0.250M “02 and 0.250M HNO3? Firm1 ) 330+ ) MC; . Hto ((1) Calculate the pH of this solution. (Which is the dominant equilibrium reaction?) Saw?- “9 ([0) $6856? moi [hail : o. 290 45 Thus, K“ ; (.293 +70 (10 2: ”ELM ( ago ~90 ago 01'“); A‘K: 4.0Kfopqfl 5g Rdie: #cgfitol—if Klee '1 (LE—Li “. “iél Léfél SQ vaifd .293 ‘2; flSSU-MPHM L+= ., ' __ A) . H1 ozcothpL -0-2§un_4 ) PH;&.60 ...
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