Trial Flask 1 0.01 M KI 0.001 M Na2S2O3 H2O 1 10 mL 10 mL 10 mL 2 20 mL 10 mL 0
ID: 506483 • Letter: T
Question
Trial Flask 1
0.01 M KI 0.001 M Na2S2O3 H2O
1 10 mL 10 mL 10 mL
2 20 mL 10 mL 0 mL
3 10 mL 10 mL 0 mL
4 10 mL 10 mL 0 mL
5 7.5 mL 10 mL 10 mL
Trial Flask 2 0.04 MKBrO3 0.1 MHCl Starch
1 10 mL 10 mL 3 drops
2 10 mL 10 mL 3 drops
3 20 mL 10 mL 3 drops
4 10 mL 20 mL 3 drops
5 7.5 mL 15 mL 3 drops
1. To facilitate the calculation of the rate law orders, calculate the concentration of each reactant in trials 1 through 5 (part A) after the flask contents have been combined but before reaction takes place. In the table below [I-] = [KI], [BrO3-] = [KBrO3], and [H+]=[HCl]. We only list the ions, because they are what react in the net ionic equation.
Trial [I-] [BrO3-] [H+]
1
2
3
4
5
Explanation / Answer
Calculation of concentrations,
Trial flask 1
No. [I-] (M) [S2O3^2-] (M)
1. 0.01M x 10ml/30ml = 0.0033 0.001M x 10ml/30ml = 0.00033
2. 0.01M x 20ml/30ml = 0.0066 0.001M x 10ml/30ml = 0.00033
3. 0.01M x 10ml/20ml = 0.005 0.001M x 10ml/20ml = 0.00033
4. 0.01M x 10ml/20ml = 0.005 0.001M x 10ml/20ml = 0.0005
5. 0.01M x 7.5ml/27.5ml = 0.0027 0.001M x 10ml/27.5ml = 0.00036
Trial flask 2
No. [BrO3-] (M) [H+] (M)
1. 0.04M x 10ml/20ml = 0.02 0.1M x 10ml/20ml = 0.05
2. 0.04M x 10ml/20ml = 0.02 0.1M x 10ml/20ml = 0.05
3. 0.04M x 20ml/30ml = 0.026 0.1M x 10ml/30ml = 0.05
4. 0.04M x 10ml/30ml = 0.013 0.1M x 20ml/30ml = 0.066
5. 0.04M x 7.5ml/22.5ml = 0.013 0.1M x 15ml/22.5ml = 0.066
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