1.When the reaction between bromate ions and bromide ions was studied, the follo

Question

1.When the reaction between bromate ions and bromide ions was studied, the following tabulated data was obtained:

BrO3 + 5Br + 6H ---> 3Br2 + 2H2O

In order to determine the reaction order of bromate, calculate the following:

1. Initial concentrations of bromate ion

Reaction #1 Reaction #2

2. Initial reaction rate with respect to bromate disappearance

Reaction #1 Reaction #2

3. Ratio of reaction #1 rate/reaction #2 rate

4. Log of reaction rate ratio

5. Ratio of concentration of bromate ion, reaction #1/reaction #2

6. Log of concentration ratio

7. Reaction order for bromate ion

Exp. # Volume of .4M BrO3 Volume of 0.4M Br Volume of 0.4M H Volume of water Reaction time 1 10.0 mL 10.0 mL 10.0 mL 10.0 mL 121 seconds 2 20.0 mL 10.0 mL 10.0 mL 0 mL 124 seconds

Explanation / Answer

1. Initial concentration of bromate ion

Reaction #1          0.4 M x 10 ml/40 ml = 0.1 M

Reaction #2          0.4 M x 20 ml/40 ml = 0.2 M

2. Initial reaction rate with respect to bromate disappearence

Reaction #1 : [0.1 M - (0.4 M x 10 ml/40 ml x 5)/121 s = 6.61 x 10^-4 M/s

Reaction #2 : [0.2 M - (0.4 M x 10 ml/40 ml x 5)/124 s = 1.45 x 10^-3 M/s

3. Ratio of reaction #1 rate/reaction #2 rate = 6.61 x 10^-4/1.45 x 10^-3 = 0.456

4. Log of reaction rate ratio = log(0.456) = -0.3410

5. ratio of conc. = (reaction #1/reaction #2) = (0.1/0.2) = 0.5

6. log of ratio of conc. of bromate = log(0.5) = -0.3010

7. Reaction order for bromate ion = (-0.3410/-0.3010) = 1

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