CHML 1046 General Chemistry 2 Laboratory
Experiment “The Rate Law of an Iodine Clock Reaction”
Objectives: To apply method of initial rates for investigation of influence of concentrations of reactants on the rate of the reaction. Determine the rate law of a particular reaction experimentally. Observe the effect of catalyst on the reaction rate. Examine the influence of temperature on the rate of this reaction. Calculate activation energy for the reaction from rate constants at two different temperatures. Practice the use of volumetric glassware. Master calculations of solution concentrations.
Introduction:
The following primary reaction will be investigated in this experiment:
S2O8 2– + 2I– I2 + 2SO4 2– …show more content…
List factors affecting the rate of a chemical reaction:
2. Why the reaction you are studying is called “Iodine Clock Reaction”?
3. What catalyst will be used during this experiment? How use of catalyst should affect the rate of a reaction?
4. Discuss special safety precautions that must be observed during this experiment. Be specific!
5. Use data from Table 1 to calculate concentrations of [S2O82-] and [I-] for the Experiments 1-3. Show the details of your calculations:
Record the results in Table 2.
Table 2. Calculations
Experiment # [S2O82-], M [I-], M Average time, s Initial Rate, M/s Rate constant,
Determine the unit!
1
170
2
86
3
84
6. Calculate Initial Rates for the Experiments 1-3 using Average time given in Table 2 and calculated concentrations of [S2O82-] and [I-]. Show your
Experiment “The Rate Law of an Iodine Clock Reaction”
Objectives: To apply method of initial rates for investigation of influence of concentrations of reactants on the rate of the reaction. Determine the rate law of a particular reaction experimentally. Observe the effect of catalyst on the reaction rate. Examine the influence of temperature on the rate of this reaction. Calculate activation energy for the reaction from rate constants at two different temperatures. Practice the use of volumetric glassware. Master calculations of solution concentrations.
Introduction:
The following primary reaction will be investigated in this experiment:
S2O8 2– + 2I– I2 + 2SO4 2– …show more content…
List factors affecting the rate of a chemical reaction:
2. Why the reaction you are studying is called “Iodine Clock Reaction”?
3. What catalyst will be used during this experiment? How use of catalyst should affect the rate of a reaction?
4. Discuss special safety precautions that must be observed during this experiment. Be specific!
5. Use data from Table 1 to calculate concentrations of [S2O82-] and [I-] for the Experiments 1-3. Show the details of your calculations:
Record the results in Table 2.
Table 2. Calculations
Experiment # [S2O82-], M [I-], M Average time, s Initial Rate, M/s Rate constant,
Determine the unit!
1
170
2
86
3
84
6. Calculate Initial Rates for the Experiments 1-3 using Average time given in Table 2 and calculated concentrations of [S2O82-] and [I-]. Show your