In this lab we will be expressing rate as a change in concentration of reactants over time. In order to calculate this we need to know the initial concentrations of our reagents after they are combined but before the reaction occurs. This is a dilution process. Recall that the calculation for a dilution is accomplished using the relationship M1V1 = M2V2. Complete the columns in table 3 for the initial concentrations of [I-] and [Fe3+]. As an example: For each trial the total volume, including the starch, is 100.25 mL. We will be using 0.0500 M KI and 0.0500 M Fe(NO3)3. For trial #1: [Fe3+] = (0.0100 L x 0.0500 mol/L) ÷ 0.10025 L = 0.00499 M Your answers for questions 1-6 should each have 3 sig figs. Questions 1-6 will ask you to calculate the initial concentration of either [I-] or [Fe3+] for each trial. You should then put the answers in table 3 on your lab report. What is the initial [I-] for trial #1? What is the initial [I-] for trial #2? What is the initial [I-] for trial #3? What is the initial [Fe3+] for trial #1? What is the initial [Fe3+] for trial #2? What is the initial [Fe3+] for trial #3?
In this lab we will be expressing rate as a change in concentration of reactants over time. In order to calculate this we need to know the initial concentrations of our reagents after they are combined but before the reaction occurs. This is a dilution process. Recall that the calculation for a dilution is accomplished using the relationship M1V1 = M2V2. Complete the columns in table 3 for the initial concentrations of [I-] and [Fe3+].
As an example: For each trial the total volume, including the starch, is 100.25 mL. We will be using 0.0500 M KI and 0.0500 M Fe(NO3)3.
For trial #1: [Fe3+] = (0.0100 L x 0.0500 mol/L) ÷ 0.10025 L = 0.00499 M
Your answers for questions 1-6 should each have 3 sig figs. Questions 1-6 will ask you to calculate the initial concentration of either [I-] or [Fe3+] for each trial.
You should then put the answers in table 3 on your lab report.
What is the initial [I-] for trial #1?
What is the initial [I-] for trial #2?
What is the initial [I-] for trial #3?
What is the initial [Fe3+] for trial #1?
What is the initial [Fe3+] for trial #2?
What is the initial [Fe3+] for trial #3?
| 125-mL Erlenmeyer Flask | 250-mL Beaker |
| Trial | KI | Na2S2O3 | H2O |
Starch ( 5 drops) |
Fe(NO3)3 | HNO3 | H2O |
| #1 | 10.00 | 10.00 | 10.00 | 0.25 | 10.00 | 20.00 | 40.00 |
| #2 | 10.00 | 10.00 | 10.00 | 0.25 | 5.00 | 20.00 | 45.00 |
| #3 | 5.00 | 10.00 | 15.00 | 0.25 | 10.00 | 20.00 | 40.00 |
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