Exam 2 p3 - page 3 8 8 points(a Explain how you would...

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Unformatted text preview: page 3 8. 8 points. (a) Explain how you would decide which is more acidic, NH; or HONH3)+ . Eied‘t'm‘ejfljfiltifi Oiajeh [nodded {—9 hf‘rgjg... w {theifkw'g 2," Jews? Fa) Puefifiz‘? 5 (We, weakens, NFH been! (b) How do you explain the difference in acidity between NH4+ and PH4+ ? (P is ri ht under N in the 8 period”: tabla) E’ {s larxer ‘Hmo. [U and ACorvus o. Nels her (can! ‘i‘v He Wm” H R>A>E>1 CM amt—u. cg «(99M 5- Fae) (c) How do you decide if the following oxides give acidic, basic, or neutral solutions when dissolved in water? CaO $02 Okiclts pg, 5“;ng uSm-[lxt ,g‘tfvn‘ Luli‘c 50L,H¢,,> (l ”Gm/weird Gauge"; £9fm5 Ctdci’lt SciUHOo.5 ((1) Show the Lewis acid-Lewis base reaction that takes place between H20 and C02. What are the steps? I H I \R H /0 9. 4 points. (a) Besides the dilution effect, why is the second dissociation step of sulfin‘ic acid, H2804, enhanced at low concentrations of the acid? (ow WW it,“ 9.41 <§€L+ , 911’, 1 ,«x gflppm, 5e9/ §+QP .i 1“ (1" $19,, (- ”‘9 .11 {f 9.9,; +— ”30+ (“raj adv) ‘05 labia [H304] @QJ‘MJ Slit) a: HS-qut- H‘o '3 330* + 5.0?7,’ (WEAA-Adil) £r0M ngp L (03 Iow‘ (b) Calculate [H+] in a solution initially containing 1.0 M HF and 1.0 M NaF. (Ka = 7.2 x 104 0W“) What are the major species before equilibrium? What is the dominant reaction involved in establishing equilibrium?) . _ + .. _ + . HF + we ? He + F k .7.m-‘*-EJ_YH_1<LLQ. in?“ lv0 ’1 (04;; Lo 1} 0‘ {HF} (lvwcx) (LWJZ. ’x +x *4; terLxlzK - . ‘ _ . l-O gwl \.o 4. K (‘ a 1L K) (AsSuwu‘ytg K441\o) -. , --‘i g \ ‘X : Elgar—l: 7.2Mo Hf} 8 (067i) 3/: ruiei 7i}? H092" .07224‘S4 )0 watt, Pili- 3,ll'i‘ .; 0 0° «Stuwyifim (c) If NaF were absent in (b), would the [H+ ] [@M lower? Why? , \b Fss’aduiq‘am 4(— H hof SWPNSSYJ b3. HA2 ChWWlGM lg“ FE (Le liMllC' grit/(dye) 10. 8 points. (a) Will the following buffered solutions have th.r difi‘erent pH? 0.050 M NH3/0.15 M NH4C1 and 0.50 M NH3 / 1.50 M NH4C1 rad—Tog are H e 9%: (b) After 0.010 mol gaseous HCl is added to 250.0 mL of each solution, will the pH of the resulting solutions be the same [email protected]@> Hm: louQQtrtwj Cwouiifyfi MCw-éC’U-Wt, He, More (,onk“ $Olui‘r‘0u vrowdl‘vj [belie—r (WiQQQrFV‘g,...
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