CW 8 - CHM 2046. Class Worksheet 8 Acids and Bases —...

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Unformatted text preview: CHM 2046. Class Worksheet 8 Acids and Bases — Calculations 1. The Aggroximate Method: For 0.20 M HCN (Ka = 4.0 x 10-10) what are the equilibrium [. . .] values and the pH? _. — + {- HCN 4:11:10. &—3 H39 + C“ ' O 1' 0210 0 C “'Jk +3“ +3’\ 3>a/0\.\Cflmcgroj>x- F 0-10—54. “MW/L lwmwg‘ ,IO I LI 0 I __[,9 M2. - t ‘ ‘ ' K o r d_____ Omwuj 7L << 020 KH'Oxla‘HIDxOQQg“ : 3x. -az ‘ .: VL- [HCN]=-———_—.O'MM’ [CN']=[H30+]= R—qxlo‘emg >dopH=_fl5 Would the approximate method work for HClOz (Worksheet 7, Problem 6)? 0 Howwouldyouknow,inadvance? KER SLgv‘M \g{ V. gMaQL l0, -: ' 4.0 ea,~cej"o- w >> Kw cco— ow 2. The Weak Acid Shortcut: Q C0 . a“ 7.. Kalfifil— wagoW/m/ 00—7“— Co {5‘00 7" [Hsofl a 3. A Weak Base Problem: For 0.0050 M CH3NH2 (Kb = 4,4 x 10-4) hat are tie * values of[...] and pH? ) K13 Wm es a” M929 M + .. W CHgN H; +4429 fig C’H‘BN‘E + 9H MT! (0 . O 091) 0 O C, _. 7L +7“— +% r I: o Oogor-% W 3’“ 2“ 4+ #2:;— = Mr x10 7L,:i*32<10”3 4. The Weak Base Shortcut: What are the [. . .] and pH for 0.2 M NaCN? (forCN',Kb=1.6x10'5) Nam g3 & WEI. bed-Z... .mgolivbb Nef + CM", Mast L. Wm... rm. cw .— wwc 1m... 4L0“ QN 4442/0 g: @H’JrHCN 0520 I éxlO's’: it: E W _.._ 3x Ema—5x302— O'Z' 0 91, 3 1 8x10“ 7L2COH'] ;-, m [CN-]= 0 92 M [HCN]=[OH_]= WSW/63;“! PH=M 5. The Relationship of Ka to Kb for a CA/CB Pair. . + r“ yo? + Map “3.— HLg 0 yr" _. MM ‘ ' + KNEW PaOQHLO g H30 +HO" 6. What is Kb for HPo4-2 (based on Ka values in the A/B Handout)? .— I q _. K I >< \ 0 KL r ” _—_.:._-—“-""—'w-——_ Qfi‘wtfl ' 62cm“, 7. Identify each solution as m (A), hasjg (B), or pH 119113] (N). I 7‘2 . Thinkionic! :om‘c Wauuxio m aLL _ W mow, M. wee—Lfldot 0.». 1.224%. 5242—. u 0 Look at the NB chart to see if any of the fins present are acidic or basic. i (a)NH4c:1(aq) + w i . / NHLI U am; Ung o... PH 04Wfiéé. ‘1, % n 0+" E “Jr” L 1:14" 8 91:32 ’9‘" 1:535 E (b)Na2C03 (aq) ” 2 P r F)"— r‘a' ‘ ' — F “ . ® C293 .3, \CLQ—g/LL %-Q\w£:pr~ :: FH'J “Eva- bat/ML- . ' (C)KN03(3CI) # . H- ® // Wuogam M«fio"\?rnz. .‘-Y\Q(,.:9r~<-€J‘ $43“ 3 wt. (61) NazHPO4 (3‘1) -- $3.5MO‘B (E2; lFrau/’9' ' 2.-"_ = , ZR F P g , , fivlrbwo'l—plwfiwww a. H POVGW¢WQ kwmé‘b.‘ lea/“Lth Mr @‘rEiAfixwL; I? P“ g G, fibfllmJCthUCB 7:34» H :— 8. Circle the solution that has the Box that which has the lam ...
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CW 8 - CHM 2046. Class Worksheet 8 Acids and Bases —...

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