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Oct 30, 2023

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ANssq MHorales Chapter 17 In Class Practlce Lesson 10 Weak ACIdS and Bases and Conjugates | Weak Acids and Acid Ionlzatlon Constants 5 ! 1) Calculate the pH at 25°C ofa 0.065 M solut|on of a weak acid that has Ka =1 2 X 10 P ' ‘ 4 Nk i ; I OCDGS ‘ | | )\ 8 85\76 \x lO °' il O.0e5-x L ~\03 ><= 5}0’3‘ 5 \‘ , i STt o Jiel Jow e 1) 2) At what concentratlon does hydrocyanlc acnd eXhlblt (a) 0. 05 % |on|zat|on (b) 0. 10% iy @) “ionization, and (c) 0.15 % |on|zat|on’? Ka= EQ X 10 1° o m,,,o.;g AT VI _o,ooos[rENJ. ‘ H0') it = _ X G T x IOCD OOS 4 q 10" Le) 2o 22, leO EHcNJ = \-HC'N'] X Cx].C’(j [HC N - x D‘*CNJ L\’\'CNJa i il 7 i i -ao:/———— | A is '-[qx{O \~2 5,\10 [HCNJ tha= q‘q"vlo e LHch -X : e | , T ‘ | [:H’,O J "O O@OS JO OOlqé [HcN ' qax\o” '’ 1[HCN] X" i s U’*‘NJ o e ] el ) i f X {p-'9 c ‘ {CH. ‘M!o ) L#CNJ ‘>< D—bOJ %ﬂ~ O Ooo_S \" ‘ _M¥2N] X 0= OLN0 ‘ | L\ q X\O 0?_ | XlO'E EH‘CNJ ! Gl ‘° : ' A ..o\_,____ [0 “h 17 M ﬂ q ‘O H LH CN:' f('-l q xtO""’)[H(_ rJ] [kend, @‘\x\o"")mcm - 0,0010LHeNT, _Ooolo | ” | : Lt id ' : { qu\O"a[H;AQJ 9\ ;25)< O"‘LHCT\D% ) Ins0'] L >L\J\cm x\w O'\S hfud 4qx\0"°—:z 25x1@ CHcN)o " ‘ - [HCN]O ; ] e _4 F—'CN] W“*!O"?[ficm 922 B ‘Q; i "U ! o] TRCNY, =0, 0o\5 Mot ‘ (100" HNT = 60,0015 e 2 Scanned with CamScanner

3) Calculate the Ka of a weak acid if a 0.015 M solutlon of the acid has a pH of 5.03 at 25°C FLN 0,015 PH=S,03 =110y Iny0') .k [9.22254%107] [§.3525410°] [;430*3—.\0-503 il \[0-0‘5’q-3525'—13x10 6] & q.222595¢107° Y ERLBEs T Ge E 0,015 -9,23254%x07% Weak Bases and Base lonization Consfants 4) Calculate the pH at 25°C of 2 0.16 M solutlon of a weak base with a Kb 0f 2.9 x 101, O, 16 | Q 54065 92 x 107 —>'< foH2 _.\o_c-j(;llsqoésq.lxlo') 5 64,67‘1[0! POH — B Uk PH o H =\ £ O % ' PH-\%C&? 5@447qw| e }H il =X x0T s A P 06X T ooy o =K o 5) Determine the Kb ofa weak base |fa035 Msolutlon ofthe base has a pH of11 84 at 25°C. PH+POH “"00 : IO?)_S b AEey (GQ\%B(’)C]7XIO })l : 14.00 — .84 =2, tg c@q\ s bie S0 , B30Ax 10 (.35 9182097 x107) L 107 = FAUB30 0 :l[oHvﬂ, 1] ans—(o«d\%o‘}?x[o bb =19 xio ! Conjugate Acid-Base Pairs | 6) Determine (a) Kb of the weak base B whose conjugate acid HB* has a Ka=8.9 x 10 and (b) D Ka for the weak acid HA whose conjugate base has Kb =2.1x1078, ' : =8 Y ek oy ek Sy 161 QXN a ')b=“./fi°t - e 5 -z Valixio : s’ = ,/,‘7)9 2 %io=8 7 L‘.\7él9o‘1x10' i | 0. i fer o “b = L.l x10 1 T R | Scanned with CamScanner

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