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HW 3 KEY - CHM 2 04 6 HOMEWORK 3 DUE Name SEC TIL 1 For...

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Unformatted text preview: CHM 2 04 6 HOMEWORK 3 DUE : Name SEC TIL 1. For each equation, fill in the expected products [Chargesll]. Identify each reactant as an acid (A) or base (B), and each product as a conjugate base (CB) or conjugate acid (CA) . (a) HF(aq) I + OH'(aq) 2 F'(aq) + H 0(1) (Example) (A) (B) (ca) (EA (b) -‘HSO4’(aq) + 1120(1) 2, H3o+(aq) + sot-1'1““) A B (A 7 an i )(c) so ‘2(aq) + 110(1) “2 0H’(aq) + as»; X 133 2/? (13 (d) H803'(aq) + H3o+(aq) 2 Haw, ’+ ”1.0 I; A- (Ar 4‘5 (e) NH'(aq) + 1120(1) 2 M4; 4— W" (B? 1‘)“ {,4- 2. What are the I...) and. pH for 0.12 M NH4C1? Hints: Look up the value of the appropriate Ka in on the AIS handout. Use the "shortcut“ formula at the bottom of the handout. IVHWCI is a. shag e/‘ealiw/fl‘i : In {a’qTLHI’fl +“"5 ('5 "957%! M- TALZI“ J“; 1.9-]- rugf: Tim. N91,,"L 1‘5 4 weak and) 59 gofv-e 4 WA Frag/um; 5:51”. K4 : 516 xrc?""[§rm Hu— 2 LMJflw+) (‘5 ya {man} we. can use +1:— {Jan'l‘fiéflct' [1430*] = [mm—w) w. 1203”"- : gamma _/_.. h -5 [3134+] = 0: [RH - [NH3] = $1 2X10 M [Cl'] = 0.12 M [Hm . emu“ M [on-1 . ha “WM 91. . 9.08 What fact (available before you do any calculations) indicates that the shortcut should be valid in this case? ”9 k). ,4; 10‘5— a; (a >>1h .4 0.1:: >>5.£x/0 3. What is Kb for 1304‘3 ? -ILf ' Lax l0 {1 » h" r _,__._.3.._ Kb [c M HPer‘Z- 3.6 " “9 Kb: 0.03%? 4. Find all Lu] and the pH for 0.040 M 10%? _Hint: the approximate method will not work in this case. Check your result. N123 Pflq “5 a film/15' .el-ec‘l‘na ’y7lt‘9‘ T11.'+.'a/ly ‘Hu. fadflLflo-A 5071+“ M5 Mad“ [a 5,425+m7(&k_2'm> Mag 1%? (‘1 W‘flé WI); Tko. loaf—‘3 .‘5 .wf— 39.. weak 5a Ja ICE. r—s'a/ve a fum/mf,n Pom + H10 gr“ HM?" + 0H3 firm-""3“ (”£32753 . 0 . I 0.fl"{0 D - Salve infill/044:4 -- I ac “C _‘ 6 {7c - chm???) E amwfi”)? ,2:— ' _ EHW "1 EMF) 9 k” : [7901] x2 V. 0.935%: (mum—5c - 0 : 7(7' 4. apathy --—MJ:ID~ 0130+] .- FLF‘XIDMIBM . {0an = 0.02RM [Na+1 = OJRM . [31:04-21 = 0.013 M - [904-31 = 0. 02?: M” , 153 .' may (2353339 5.' Use Ka values available in the handout to-find the value at x for these reactions. Recall that when you add equations,. you multiply together the_K values. If you reverse an equation, . . . (a) F'(aq) + H3o+(aq) z . HF(aq) + 1120(1) . , I ' ' t . .. “team: - . 13W” M m; (b) HAcfaq) + NI-IB(aq) 2 Ac'(aq) + NH4+(aq) : . r» kn fan HA4 _.. I. 9x155“ @‘k —f k“ M Mal; __ 5'16KIU‘W ' K; 3.52 x [DH (C)' HCN(aq) +.Ac‘-(aq)' 2 CN'(aq) + HAc(aq) _ _ l ‘0 H ,e mtg/v. I’lflxlo’ A__._.._———_._. K as. ”’45. .5 "qua—9— Baum"? K'- ...
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