I am so lost? 1. A student prepared the following mixtures and measured the time
ID: 1000955 • Letter: I
Question
I am so lost? 1. A student prepared the following mixtures and measured the time each took to react. Calculate the average time for each mixture (in seconds). Mixture Vol. of 4.0 M Vol. of 1.0 Vol. of 0.0050 Vol. of Time for Time for Averace Mb(mL) acetone(mL) M'HatmL)-. : HO(mul | l time (s) Trial 2 Trial 1 92.5 86.6 _ 10 20 10 10 10 20 10 90.3 10 10 10 25 86.2 88.4 90.2 2. To complete the following table: a. Determine the initial concentration (molarity) of each reagent using the equation The Mstok and Vstoca for each reagent are given in problem 1. The total volume is 50 mL for each trial. Calculate the rate of the reaction using the equation b. (12)0 tave rate ME o.ga m Mx 1 rate rate= 0.00 (OM) 756 M 152, l55- . Rate Mixture Acetone), M (H1 M 0.20 0.0010 / ' -> 0.80
Explanation / Answer
a.Initial concentration of each reagent can be calculated by using equation
M Stock x V Stock = M initial x V initial
V Initial = 50ml
For mixture 1. M initial for acetone = 4 M x 10 = Minitial x 50
Mi = ( 4 x10)/ 50 = 0.8 M
Mixture 2. Mi = (4 x20)/50 = 1.6 M
Mixture 3. Mi = (4 x10) /50 = 0.8 M
Mixture 4. M = (4 x10) /50 = 0.8 M
Initial concentration of HCl
Mixture 1. (1M x10)/50 = 0.2 M
Mixture 2. (1M x10)/50 = 0.2 M
Mixture 3. (1M x20)/50 = 0.4 M
Mixture 4. (1M x20)/50 = 0.4 M
Initial concentration of I2
Mixture 1. (0.005M x10)/50 = 0.001 M
Mixture 2. (0.005M x10)/50 = 0.001 M
Mixture 3. (0.005M x10)/50 = 0.001M
Mixture 4. (0.005M x5)/50 = 0.0005 M
b. rate of reaction = (I2)0 /T average
Mix 1. 0.001 /132.5 = 7.54 x 10-6
Mix 2. 0.001 /91.4 = 1.09 x 10-5
Mix 3. 0.001 / 87.45 =1.15 x 10-5
Mix 4. 0.0005 / 88.4 = 5.65 x 10-6
Mixture
Vol.of4M acetone(ml)
Vol .of 1MHCl(ml)
Vol .of 0.005M I2(ml)
Vol of H2O(ml)
Time of trial 1(s)
Time of trial 2(s)
Average time(s)
1
10
10
10
20
130
134.2
132.5
2
20
10
10
10
92.5
90.3
91.4
3
10
20
10
10
86.5
88.4
87.45
4
10
10
5
25
86.6
90.2
88.4
Mixture
Vol.of4M acetone(ml)
Vol .of 1MHCl(ml)
Vol .of 0.005M I2(ml)
Vol of H2O(ml)
Time of trial 1(s)
Time of trial 2(s)
Average time(s)
1
10
10
10
20
130
134.2
132.5
2
20
10
10
10
92.5
90.3
91.4
3
10
20
10
10
86.5
88.4
87.45
4
10
10
5
25
86.6
90.2
88.4
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