Exam 2 p4 - page 4(c How would you improve on these buffer...

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Unformatted text preview: page 4 (c) How would you improve on these buffer solutions, and what would the improvement be? Eifuhil'sfi- ‘HAQ catkcevax‘rt-XLTOMJ 04 He (\cfcl 04M?! [OCASE (Abwpfllnemis- (d) Calculate the pH of the second buffer solution above (0.50 M NH3/ 1.50 M NH4C1) after 0.10 mol gaseous HCl has been added to 250.0 mL of the solution. -. 0 4,9 g HC€ (What are the major species before HCl addition? What reaction goes virtually to completion after HCl addition? What equilibrium reaction determines the pH as the solution adjusts to the equilibrium position?) ngPl'el—g read-Pot. is QSSUME‘J between SSH-gag and M? N613? age a: w} .- oJ—{o fl -: Dale 5 Wis (21% or newEflHfl1=Lg°fl4¢iOfl . < (.70 M “(,4— 4:3J'UX+MCM+ ($cwe reversafl> (”RAP/l Place *0 I‘eesfizgjfiihadqm ...» gum: Hus rs a (jogger 54‘4me (tun use Henley-4w» IL'LaSYP/La'ff—L efuufi‘w. Flt “4% +43 233*] L‘j (§.CNGIG)4 103 (3'— f:)= 9 i? + (“18) 7 77 ‘f A“ /CE Aug/C Could 51/59 48 used (I‘Mfleaduf fife 4/0" Cfutug‘oq) 11. 5 points. (a) When a mixture of HCN and NaCN is prepared in aqueous solution, what are the two reactions that are simultaneously taking place? (Ignore the autoionization of water.) Write balanced equations. “Lad {r ((10 ”if (Jr-30+"r CA)” (hog). cm" + #10 "3(Ua’t) + HCN + 0H‘ (b) Which reaction is dominant when the concentrations are 0.40 M HCN and 0.60 M NaCN. '17 fH = . ‘1 ’ a"? - Onwhatbasrs (K.o CN 62x10°) ((49 4 m . L,“ _ 14x10" C k b> K 6 ,2on 9 CK (LL21 26 Fe fie ease JASSQDLLfifo“ (lhd rqué‘gu) AOM" (Lifts (0) Use the Henderson-Hasselbalch equation to determine the pH of this solution. B A sea”. A - tom F”: W t (a #73:] 6 l’“ 43 Elf—HER) W“ + (20% +9402 + 47¢ GR .Ma ,‘_ ' as ”me FDfi-* pkg + [07 gig—‘31 Dé cqu “Se (CE Frag i — +£2.93 (d) What assumption is implicit in the use of the Henderson—Hasselbalch equation for a calculation such as (c). (Please be specific) 2%” “‘M WW‘WM “at L’GC‘PPWNMMGJ (’3 mm WWW LctquSc- He OUFE Is cal S>:3le7§w+ ($55M 0.0. 9—23 ...
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