Question

A Chemical Clock Your Report: Part I: Determination of the Rate Law 1. Complete Table 1 below using the volumes of each chemical used and the reaction to the reaction times measured that your team used to determine the rate law. Leave any unused rows D Reaction Mixture: Reaction Time / s /27 24 Table 1: Reaction Mixtures used to Determine the Rate Law Flask! Flask Il Reaction 0.0010-M 0.010-M 0.040-M 0.10 M Starch Tomp / °C Na,s,o, KI HO K Bro HCI (drops) 10.0 mL 10.0 mL. 10.0 mL 100 mL 10.0 ml. 3-4 24.0 OML2L 70ML 10om2100 ron form 10,0 m2 3 21 70, ML 510 m2 15,0 ML 1.0mL10.0mL 3 245 11.8ML 20.0mL ...om 10,0 mL /0,1 ML 3 24.5 10,0 L V L 15,00 SOL 10,ML 24,5 10.0 ML 100ML 2,00L / 0,1L 20. 3 24,5 -0.6 ml tom. 15,102 VOL 5.0mL 3 2415 H13 56, 273,6787 208.6 2516 in 2. Using the data in Table 1, calculate the initial concentration of thiosulfate lon, S,O, Reaction Mixture 1 (show all work and units): 3. Using the concentration of thiosulfate ion in Reaction Mixture 1 and your measured reaction time, determine the initial reaction rate for Mixture 1 (show all work and units):

how can i get the initial concentration of thiosulfate ion (S2O3) in reaction mixture 1 ?

and also how can i determine the initial reaction rate for mixture 1?

Answer 1

Solution. Iodine clock Reaction: iiBroz +61 +647 -7 352 +3426 +87 ci) In +2N425103 -> 2 Na I + W42 5406 Babe = 0[1905] = -4 4007 = + 9(1) from the stoichioning of equation (ii) © [11] = [5203] 05]. Jane At. equation ( 2- 7: gate = 152035 1 ALI2] = = gate 1x 1 [5:03 Dt 2 ] et 1 . At Scanned with CamScanner

Now Initial concentration of S203²- M, V1 = M2 V2 where, mi= 0.0010 VI = lomli V2 = total volume = 50mL... M2 = ? M2 = miri V2 = 0.0000 x 10mL Me . 50ml [51031-). = 0.0002 M Please note that [5203²-70 = 0.0002 it is constant in all reaction mixture because we have the taken To me in each test and takel volume is some in each test Please note that the concentration of Sioe is very less as compare to the kBros. this is the main trick in this experiment' .. . what is significance of Blue color appeagance Bleu color appears when all 5203² - consumed. Therefore [5,6;7] final to incell tegh cs Camscanner A[si ogl ] = [5:03 " Jimikap - [S203) sinol

D[S203"] = [S203" Jiminud iodine This is the whole concept of clock reaction duke = $ x S tipo a = tx [S203?- Jinitial 1 At 0.0002 (molk) 127 sec = 2.62x10-t mal ) gale IL-sec ) Scanned with CamScanner