Chemistry Lab
Mecky18
CHM101LM5FactorsAffectingReactionRatesLabReport.docx5
Factors Affecting Reaction Rates Student Name Date
Data
Activity 1
Data Table 1: Calibration
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Trial |
Na2S2O3 (drops) |
Reaction time (sec) |
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1 |
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2 |
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3 |
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1. How many drops will be used in the remaining experiments?
Activity 2
Data Table 2a. Effects of KI (I-) Concentration
|
Trial |
KI (drops) |
HCl (drops) |
Starch (drops) |
H2O (drops) |
Na2S2O3 (drops) |
H2O2 (mL) |
Time1 (sec) |
Time2 (sec) |
Average time (Tavg) (sec) |
Rate (1/Tavg) |
|
1 |
8 |
2 |
4 |
0 |
|
0.4 |
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2 |
8 |
2 |
4 |
0 |
|
0.4 |
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3 |
6 |
2 |
4 |
2 |
|
0.4 |
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4 |
6 |
2 |
4 |
2 |
|
0.4 |
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5 |
4 |
2 |
4 |
4 |
|
0.4 |
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6 |
4 |
2 |
4 |
4 |
|
0.4 |
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7 |
2 |
2 |
4 |
6 |
|
0.4 |
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8 |
2 |
2 |
4 |
6 |
|
0.4 |
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Data Table 2b. Effects of H2O2 Concentration
|
Trial |
KI (drops) |
HCl (drops) |
Starch (drops) |
H2O (mL) |
Na2S2O3 (drops) |
H2O2 (mL) |
Time1 (sec) |
Time2 (sec) |
Average time (Tavg) (sec) |
Rate (1/Tavg) |
|
1 |
8 |
2 |
4 |
0 |
|
0.4 |
|
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2 |
8 |
2 |
4 |
0 |
|
0.4 |
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3 |
8 |
2 |
4 |
0.1 |
|
0.3 |
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4 |
8 |
2 |
4 |
0.1 |
|
0.3 |
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5 |
8 |
2 |
4 |
0.2 |
|
0.2 |
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6 |
8 |
2 |
4 |
0.2 |
|
0.2 |
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7 |
8 |
2 |
4 |
0.3 |
|
0.1 |
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8 |
8 |
2 |
4 |
0.3 |
|
0.1 |
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Data Table 2c. Effects of HCl (H+) Concentration
|
Trial |
KI (drops) |
HCl (%) |
Starch (drops) |
H2O (drops) |
Na2S2O3 (drops) |
H2O2 (mL) |
Time1 (sec) |
Time2 (sec) |
Average time (Tavg) (sec) |
Rate (1/Tavg) |
|
1 |
8 |
100% |
4 |
0 |
|
0.4 |
|
|
|
|
|
2 |
8 |
100% |
4 |
0 |
|
0.4 |
|
|
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3 |
8 |
75% |
4 |
0 |
|
0.4 |
|
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4 |
8 |
75% |
4 |
0 |
|
0.4 |
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5 |
8 |
50% |
4 |
0 |
|
0.4 |
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6 |
8 |
50% |
4 |
0 |
|
0.4 |
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7 |
8 |
25% |
4 |
0 |
|
0.4 |
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8 |
8 |
25% |
4 |
0 |
|
0.4 |
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Activity 3
Data Table 3. Temperature Effects
|
Water bath trial |
Temperature of the water bath (°C) |
Reaction time (sec) |
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Cold water |
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Room-temperature water |
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Hot water |
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2. Explain how each of these treatments affected the reaction rate. Describe the effect at a molecular level.
a. Concentration
b. Temperature
Activity 4
Data Table 4. Catalyst
|
Trial |
Water (drops) |
CuSO4 (drops) |
Reaction time (sec) |
|
1 |
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2 |
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3 |
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4 |
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5 |
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3. How did the addition of copper(II) sulfate affect the reaction rate? Did the amount of catalyst affect the reaction rate?
Activity 5:
Data Table 5. Orders of Reactants in the Rate Law
R = k[I–]m[H2O2]n[H+]p
Calculated Reaction order (X) (e.g. )
|
Reactant |
Concentration |
Average Rate |
Calculated Reaction order (X) |
Average Reaction order |
Reaction Order (integer) |
|
KI (I) |
8 drops |
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m = |
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KI (I) |
6 drops |
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KI (I) |
4 drops |
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KI (I) |
2 drops |
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H2O2 |
0.4 mL |
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n = |
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H2O2 |
0.3 mL |
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H2O2 |
0.2 mL |
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H2O2 |
0.1 mL |
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HCl (H+) |
100% |
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p = |
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HCl (H+) |
75% |
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HCl (H+) |
50% |
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HCl (H+) |
25% |
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Rate law |
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Overall order of the reaction |
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4. Use the rate-law expression you determined for Data Table 5 to answer the following questions.
a. If the concentration of I– was doubled, how would that affect the reaction rate?
b. If the concentration of H2O2 was halved, how would that affect the reaction rate?
c. If the concentrations of I– and H2O2 were both doubled, how would that affect the reaction rate?
d. If the concentration of H+ (HCl) was doubled, how would that affect the reaction rate?
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