Calculate the initial [H₂O₂] on the paper ([H₂O₂]0), assuming the amount of H₂O₂ you added initially was diluted through the total volume of all reagents added to the paper: Average time (s) [H₂O₂] (M) Run 1 210.6 Calculate the initial [] on the paper ([1]), assuming the amount of you added initially was diluted through the total volume of all reagents added to the paper: Average time (s) [1] (M) 210.6 Run 1 Calculate the initial [S₂O3³] on the paper ([S2O3²¹]o), assuming the amount of S₂03³* you added nitially was diluted through the total volume of all reagents added to the paper: Average time (s) [S.O,²] (M) Run 1 210.6

Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Part 4: Runs 2-4
1. Repeat the steps in Part 3 for runs 2-4. You should have 5 trials per run.
Run #
1
2
3
4
Run 1
Run 1 210.6
Trial 1 (s)
Trial 2 (s)
218 201
66
79
71
289 335 301
87
79
Run 1 210.6
Trial 3 (s) Trial 4 (s)
Trial 5 (s)
201 222 205
73 825
Calculate the initial [H₂O₂] on the paper ([H₂O₂]0), assuming the amount of H₂O₂ you added initially
was diluted through the total volume of all reagents added to the paper:
Average time (s) [H₂O₂] (M)
287 358
Calculate the initial [1] on the paper ([1]o), assuming the amount of you added initially was
diluted through the total volume of all reagents added to the paper:
Average time (s) [1]. (M)
74 89 81
Average time (s) [S₂0₂²] (M)
210.6
Calculate the initial [S₂O3³] on the paper ([S2O3²"]0), assuming the amount of S₂O3² you added
initially was diluted through the total volume of all reagents added to the paper:
Quantity
[Na₂S₂O3] stock
[KI] stock
[H₂O₂] stock
k'
0.005M
0.2M
0.1M
0.0386
Value
Transcribed Image Text:Part 4: Runs 2-4 1. Repeat the steps in Part 3 for runs 2-4. You should have 5 trials per run. Run # 1 2 3 4 Run 1 Run 1 210.6 Trial 1 (s) Trial 2 (s) 218 201 66 79 71 289 335 301 87 79 Run 1 210.6 Trial 3 (s) Trial 4 (s) Trial 5 (s) 201 222 205 73 825 Calculate the initial [H₂O₂] on the paper ([H₂O₂]0), assuming the amount of H₂O₂ you added initially was diluted through the total volume of all reagents added to the paper: Average time (s) [H₂O₂] (M) 287 358 Calculate the initial [1] on the paper ([1]o), assuming the amount of you added initially was diluted through the total volume of all reagents added to the paper: Average time (s) [1]. (M) 74 89 81 Average time (s) [S₂0₂²] (M) 210.6 Calculate the initial [S₂O3³] on the paper ([S2O3²"]0), assuming the amount of S₂O3² you added initially was diluted through the total volume of all reagents added to the paper: Quantity [Na₂S₂O3] stock [KI] stock [H₂O₂] stock k' 0.005M 0.2M 0.1M 0.0386 Value
Part 1: Getting Ready
1. Obtain 5 pieces of filter paper from your TA.
2. Record the exact stock concentrations of the reactants into Table
2.
3. Obtain one pump (10 mL) of Na2S₂O3 in a 50 ml beaker.
4. In a 50 mL beaker, obtain (12.5 mL) of 0.2 MKI.
5. Obtain one pump (12.5 mL) of 0.1 M H₂O₂ in a 50 mL beaker and add 10
drops of 6M HCL.
6. Divide the filter paper into quarters.
Part 2: Preparation of Solutions
1. In a 25.00 mL volumetric flask add one pump (12.5 mL) of 0.1M H₂O₂, add
10 drops of 6M HCL, and dilute to the mark with RO water.
2. In a 25.00 mL volumetric flask add one pump (12.5 mL) of 0.2M KI and dilute
to the mark with RO water.
Part 3: Run 1
1. Place your watch glass on top of your white tile.
2. Place a piece of filter paper on top of a watch glass. Label the filter paper
with an'x'to mark the center or target area for your reagents (see Figure 1
on next page).
3. Add the reagents as shown in Table 1 on the target you marked on the filter
paper. Your medicine dropper should be no more than an inch from the
filter paper.
4. Start the timer as soon as you add the first drop H₂O₂.
5. Record the time when you see the first sight of brown on the filter paper.
6. Repeat steps 1-5 for this run four more times, cleaning the watch glass and
using a new filter paper for each trial.
Figure 1: Appearance of filter paper over time.
From left to right: Before reaction has started; first hint of brown appears; too much brown (after the point time
should be recorded); an extreme example of brown.
Table 1: Reagents for Runs 1-4
Run 1
Run 2
Run 3
Run 4
Na₂S₂O3
0.005M
1 drop
1 drop
1 drop
1 drop
KI
0.1M
2 drops
KI
0.2M
2 drops
2 drops
2 drops
H₂O₂
0.05M
1 drop
H₂O₂
0.1M
2 drops
2 drops
1 drop
For the eyedroppers
given, 1 drop < 10 μL
Be sure to add the
reagents in order as
listed from left to
right.
Transcribed Image Text:Part 1: Getting Ready 1. Obtain 5 pieces of filter paper from your TA. 2. Record the exact stock concentrations of the reactants into Table 2. 3. Obtain one pump (10 mL) of Na2S₂O3 in a 50 ml beaker. 4. In a 50 mL beaker, obtain (12.5 mL) of 0.2 MKI. 5. Obtain one pump (12.5 mL) of 0.1 M H₂O₂ in a 50 mL beaker and add 10 drops of 6M HCL. 6. Divide the filter paper into quarters. Part 2: Preparation of Solutions 1. In a 25.00 mL volumetric flask add one pump (12.5 mL) of 0.1M H₂O₂, add 10 drops of 6M HCL, and dilute to the mark with RO water. 2. In a 25.00 mL volumetric flask add one pump (12.5 mL) of 0.2M KI and dilute to the mark with RO water. Part 3: Run 1 1. Place your watch glass on top of your white tile. 2. Place a piece of filter paper on top of a watch glass. Label the filter paper with an'x'to mark the center or target area for your reagents (see Figure 1 on next page). 3. Add the reagents as shown in Table 1 on the target you marked on the filter paper. Your medicine dropper should be no more than an inch from the filter paper. 4. Start the timer as soon as you add the first drop H₂O₂. 5. Record the time when you see the first sight of brown on the filter paper. 6. Repeat steps 1-5 for this run four more times, cleaning the watch glass and using a new filter paper for each trial. Figure 1: Appearance of filter paper over time. From left to right: Before reaction has started; first hint of brown appears; too much brown (after the point time should be recorded); an extreme example of brown. Table 1: Reagents for Runs 1-4 Run 1 Run 2 Run 3 Run 4 Na₂S₂O3 0.005M 1 drop 1 drop 1 drop 1 drop KI 0.1M 2 drops KI 0.2M 2 drops 2 drops 2 drops H₂O₂ 0.05M 1 drop H₂O₂ 0.1M 2 drops 2 drops 1 drop For the eyedroppers given, 1 drop < 10 μL Be sure to add the reagents in order as listed from left to right.
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