REPORT SHEET EXPERIMENT Rates of 29 Chemical Reactions I: A CRock Reaction A. Pr
ID: 506231 • Letter: R
Question
REPORT SHEET EXPERIMENT Rates of 29 Chemical Reactions I: A CRock Reaction A. Preliminary Experiments 1. What are the colors of the following tons? cook co 2. The color of the starch- complex is black B. Kinetics Experiment Solution 1. Initial [s,os-1-0.050 M: m-ooso Time experiment started 3:00 time p.m initial Total moles so Time (s) between Aliquot no appearances of color Cumulative times (s) 155 155s 2.0x10 4 40x10 132 s S 131 s 421 s 6.00x10 8.0x10 4 44 s 506 10x104 12x10 159 S 14x10 Solution 2 Initial szo, 1-0,10 M: initialm1 o M. Time experiment started 3 3otime p Total moles of S20 Time between (s) Aliquot no. appearances of color Cumulative times 2.0x10 4 4.0x10 19 s 208 s 269 s 6.0x1 8.0x104 10 x 10 12x10 402 14x104 79 s Copyright c 2015 Pearson Education, Inc.Explanation / Answer
From the given data
5) The rate law is,
rate = k[S2O3^2-]^x.[I-]^y
with,
order with respect to [S2O3^2-] (x) = 1
order with respect to [I-] (y) = 1
Overall order for the reaction = 2
So the net rate law becomes,
rate = k[S2O3^2-][I-]
with,
k = rate constant
From solution 1,
rate constant (k) = rate/[S2O3^2-][I-]
taking concentrations as mentioned above,
k = 0.014/(0.05)(0.05)
= 5.6 M-1.s-1
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