Exam 2 p2 - page 2 5.4 points(a A solution 15 prepared such...

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Unformatted text preview: page 2 5.4 points. (a) A solution 15 prepared such that the initial concentratin of Acetic Acid 15 0.0050 M. Dissociation takes place such that the hydrogen 1on concentration is 2. 9 x 10'4 M. What 15 the % dissociation? 2. cl Xlo w‘i a -— 7&(oo[ : 538/ O 0 o c 90 H (b) Based on the % dissociation, why would you classify Acetic Acid as a weak acid? (sheaf, G WI b are ‘59- :; Cc; 1. u U; ie as Hunt 10/; ; or WtqklaL c{((5cooj’ecp .. “:9Ckéy uhifgimé (c) Use Le Chatelier's principle to eXplain why % dissociation increases as the concentration of a we 33km“ 6') acid decreases. (Write the weak acid equilibrium constant expression, and show what happens quantitatively upon dilution.) H A + H10 :3 6130+ + A U4 Hcfl— {K1 ' - ev (9‘:- k : LREL'AU 1 U ml (10¢le 'Le‘e “" “w . 5” um ° ‘ k 5M1 / _’ \ / Qwii \ahuwx {70) FonfiUSfitutc‘i' Z Wekrrajtt : ’ii;_ 4’ r 1; (AG— 6. 4 points. H2804 is a strong acid in its first dissociation step, but a weak acid in its second dissociation step. The Ka for the latter is 1.2 x 102. (a) Write the equation for the appropriate equilibrium reaction. 119104" + 11.0 :.3‘ to" + 80$” -2 a r _ .OOXO M SOIL-«Joan- (b) Set upanICEtable. to. .. 1 1 ‘ iw“~i~ cocaine 5 0.01001: 0 Lima: .-,< 4n +94 Sir/1:120 womb“): D~ofee+n< 94 (c) Write the expression involving the equilibrium concentrations. Is it possible to ignorex ”x " in this expression? '2— : 1.1mm” 1 [036130;] 1"ka k0" [01,5qu ] (etaioo .— 7‘3 but «juw‘fll’ ("JOruPaJ-ec’ ‘6) £aC/OC) fl 2 Q c, cm.) 5 E Qt, ( 5 7. 5 points. (a) Given that Ka = 1.8 x 10'5 for Acetic Acid and Ka = 1.0 x 10'7 for H28, how would you decide which of the two, Acetate ion or HS’ , is the stronger base? Levi/*- oil i66— $1Lftmdie 5‘? (amid-36!: H C 1‘5 ”(RAM 9° COW“ Qasg ‘4 51,73“ {1‘ J- 7. x] 3 . ‘ 9 A -'~ ‘ (b) What IS {Zea Kb veggie for HS Z—H COW. h mi [p H g 9) H1 9/ whose k1 = (e -7 o lo I i0 97 Kb: (0‘7 OIJ Wtf/ <ké>m (c) Will a solution of HS be acidic or baa c? (Kfl ~ 1 x 10 19 for HS ) “‘5 7m Wbubfl. dowu'nafiE/J HS" +/-/_L:.o HZS'FOH QB (HIS-(Ha: 550 1‘82, 7fefwcf/K (d) Is a solution of NH4N02 acidic, basic, or neutral? (Circle one) If not neutral, write a balanced chemical equation for the reaction causing the solution to be acidic or basic. K, A “H‘f 39(53‘10'” KL 9, w erojm “)‘h .2gNo’° kg > KL MUCFv, C Akjotfc, ...
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