o0 TEXAS S Phan #137144 Distrib All contents of the reaction flasks may be disposed of into the sink. al: lations: Aew the method of initial rates in yur text. You will need the values for the initial concentrations of each reactant as ell as the rate. Hypothetical data for reaction: A+2B C+ 2D Run [Alo [Blo Initial A[C]/At (Molarity/sec) 1 0.150 M 0.150 M 8.00 2 0.150 M 0.300 M 16.0 3 0.300 M Rate = k[A]* [B]. We need to calculate x, y and k 0.150 M 32.0 To get x, we have to hold [B] constant and just see how [A] affects the rate. Take the ratio of Run 3/Run 1 Run 3 Initial ΔΙCI/Δt Initial A[C]/At 32.0 M/sec 8.0 M/sec k[Al[B]Y k[A]* [B]Y k(0.300M)x (0.150M) k(0.150M)* (0.150 M) X Run 1 Y Simplifying: 4.0 (0.150M) * / (0.150M) * 4.0 (0.300/0.150)x or 4.0 = 2* Or x 2 or Do the same for B (holding [A] constant) and discover that y = 1. You can calculate k as well. Using run 1: 8.00 M/sec k (0.150M)1 (0.150M)1 and solving for k, we get k = 356 M1 s1 'k' can be calculated using any of the three runs from Part I For your data: Find x and y as explained above. Calculate k for each run and average the three values at the end. If your values for x and y do not turn out to be whole numbers, round to the nearest whole number. Write the Rate Law using your values for x, y and k: = k [IF]* [H2O2]' Rate CVSO SAG Ca 2 0 ou ud Sre TEXAS INSTRUMENTS Distrib jock Reaction Part 1: PostLab Name Using your calcuations from your pre-lab, how many moles of S2O3 are consumed in the experiment? =cocoz5 mol s203 300 .OIOM S203=M9 rYol sz O O023 L S4O62(aq). How many moles of 12 will react with the 2 YI 2. Given that: 2 (aq) + 2 S2O32(aq) 21 (aq) .25 L2-S 1a s. 2.S adO moles of S2O32-? mol szoe? M:moles Zmo1s203 moiesMxL Calculate the molarity of l2 that reacted [All: (divide moles reacted by total reaction volume) (42.5mL) 3. /.0425) L (1.25x 10Smo) 2.94x 10 ALT2J Fill in the initial concentrations below using the chart on your pre-lab. 4. Reaction Rate (in Ms) = [Al2 ] / At 2.94 x IO- M AI2 Reaction Time (in s) Initial [ IT M Initial [H2O2]M Run Temp(°C) At 3प S 34 S 8.65 x lo Z1.3 c.0176M0116 1 21.lc 0196-0088 2 S S 452 L0- MsT CA123 2.94 X10-4 21.1 C .008% १ ८c 0170 3 6 ५ s 10-6 Ms- Show calculations for x and y: (Include appropriate units, attacha separate sheet if necessary.) 5. fate rate rate2 8. SA1O6MS- Rate = K CA LBY Yoe 3 raHe Rare -K CI rate 3 H202 V(E (round to the nearest whole number) y=