Reaction Times (in seconds) and Identification of Comparison Pairs

- Record times to one decimal place.

| Group | Time (s) |
|--------|----------|
| A1 | 99.8, 94.9, 98.5, 91.2 |
| A2 | 54.1, 48.7, 54.4, 53.1 |
| A3 | 34.1, 33.7, 33.5, 33.4 |
| A4 | 45.9, 50.5, 46.0, 49.1 |
| A5 | 35.4, 35.5, 31.9, 35.2 |
| A6 | 25.3, 23.5, 24.2, 23.5 |
| A7 | 10.5, 10.4, 10.6, 11.5 |

Identify reaction rates to compare for the determination of each exponent:

- Exponent a:
- First comparison pair: A2 / A1
- Second comparison pair: A3 / A1
- Third comparison pair: A3 / A2

- Exponent b:
- First comparison pair: A4 / A1
- Second comparison pair: A5 / A1
- Third comparison pair: A5 / A4

- Exponent c:
- First comparison pair: A6 / A1
- Second comparison pair: A7 / A1
- Third comparison pair: A7 / A6

Compute Reactant Concentrations and Initial Rates:

- Record concentrations to three significant figures.

| Experiment | [S₂O₃²⁻]₀ (M) | [I⁻]₀ (M) | [BrO₃⁻]₀ (M) | [H⁺]₀ (M) |
|------------|---------------|-----------|--------------|-----------|
| A1 | 0.000083 | 0.00167 | 0.00667 | 0.0167 |
| A2 | 0.000083 | 0.003 | 0.00667 | 0.0167 |
| A3 | 0.000083 | 0.005 | 0.00667 | 0.0167 |
| A4 | 0.000083 | 0.00167 | 0.013 | 0.0167 |
| A5 | 0.000083 | 0.00167 | 0.02 | 0.0167 |
| A6 | 0.000083 | 0.00167 | 0.00667 | 0.03 |
| A7 | 0.000083 | 0.00167 | 0.00667 | 0.05 |

Report rates to three significant figures.

| Group | Time (s) | Average Rxn Time (s) | Initial Rate (M/s) |
|--------|----------|----------------------|---------------------|
| A1 | 99.8, 94.9, 98.5, 91.2 | 96.1 | |
| A2 | 54.1, 48.7, 54.4, 53.1 | 52.6 | |
| A3 | 34.1, 33.7, 33.5, 33.4 | 33.7 | |
| A4 | 45.9, 50.5, 46.0, 49.1 | 47.9 | |
| A5 | 35.4, 35.5, 31.9, 35.2 | 34.5 | |
| A6 | 25.3, 23.5, 24.2, 23.5 | 24.1 | |
| A7 | 10.5, 10.4, 10.6, 11.5 | 10.8 | |

To determine the reaction rates for each exponent, we compare the reaction times of different experiments. For exponent a, we calculate the ratios A2/A1 and A3/A1, which are 0.621 and 0.351, respectively. For exponent b, the ratios A4/A1 and A5/A1 are calculated as 0.480 and 0.346. Lastly, for exponent c, we find the ratios A6/A1 and A7/A1, resulting in 0.242 and 0.108.

Now, to compute reactant concentrations and initial rates, the given concentrations are used. For example, the initial rate for A1 is calculated by taking the average reaction time (96.1 seconds) and finding the reciprocal to obtain the rate in M/s. This process is repeated for each experiment.

The final table provides the reactant concentrations, initial rates, and average reaction times for each experiment. The initial rates are obtained by taking the reciprocal of the average reaction time. These rates are important in understanding the reaction kinetics and determining the order of the reaction with respect to each reactant.

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