Question

can some one please explain me the question. the correct answer is A.
thanks

6. What is the concentration of Co(aq) ions in the solution made by adding water to cobalt(IT) nitrate (0.50 mol) and ethylenediamine (3.0 mol) so that the final volume of solution is 3.0L? The Khof (Coſen)]" is 10 x 10 a) 1.3 x 10 M b) 1.5 x 10M c) 2.9 x 10-"M d) 3.3 X 10M e) 8.7 10M

Answer 1

elos) contientration of Captcion)= moles - 005. „M Contientration of er = - IM ICE Table cort (aq) +Besi (aq) = [co (en) ] 2t (ar) Instellary OS 1 c - x - 3xx 1-50 kestab = [[co condz]"] [costcoa)] [ 3en]3 18104 - 2005-x) (1-3x)? Kstab » 1 so we knome, Co2+ ion acts as limiting Reagent. becaus. 0.5 L Tothiocfen so 005 x 70 80 x = 005 3x Coffient coffioofen 1x1014 - oor [Co2+(n) [1- 3X0-5) 5

0.5 3X0.5X0.5X0.5x10²4 14 1x1019 - 0.5/ [CO3+(62) J[0.5) [Com" (an)] = 0.5 10.5 100 5x104 [00 24 (aq)] = 1.3410th M Note moles per Cofficient of Cost = 0.5 = 00167 moles heu lefficient of en= 3 4 = 0.333 371 so. Colt acts as limiting reagent. Thank you, May this help you