In Experiment 4- Chemical Kinetics “The Rate of Chemical Reaction”, the following data were obtained: Rxn Mixture time(s) temperature (˚C) 1 190 23.0 2 378 23.0 3 97 23.0 4 205 23.0 5 44 23.0 6 90 35.0 Concentrations and portions for reaction mixture number one: H2O 0.050 M Buffer 0.050 M KI (mL) 0.1% Starch (mL) 0.0450 M Na2S2O3 (mL) 0.8525 M H202 (mL) 75.0mL 30.0mL 25.0 5.00 5.00 10.00 Use the data above to answer the following questions where applicable. (a) Write the formulas of the reactants, there are three, in the reaction being studied. Signs + or - or subscripts may be entered all on the same line; S2O32- can be entered as S2O3^2-, the symbol, ^, is not required if the sign is +/- one. Use comas to separate the reactants, for example H20, Cl- , Na+ (the order does not matter) Reactants are (b) Write a balanced net ionic equation for the reaction (“the clock”) used to measure the rate of the reaction being studied. For the arrow towards products use --> and make sure to balance it. net ionic eq = (c) Give the reactant and/or product in (b) that was responsible for the solution turning BLUE in the presence of 0.1% starch solution.
In Experiment 4-
Rxn Mixture time(s) temperature (˚C)
1 190 23.0
2 378 23.0
3 97 23.0
4 205 23.0
5 44 23.0
6 90 35.0
Concentrations and portions for reaction mixture number one:
| H2O |
0.050 M Buffer |
0.050 M KI (mL) |
0.1% Starch (mL) |
0.0450 M Na2S2O3 (mL) |
0.8525 M H202 (mL) |
| 75.0mL | 30.0mL | 25.0 | 5.00 | 5.00 | 10.00 |
Use the data above to answer the following questions where applicable.
(a) Write the formulas of the reactants, there are three, in the reaction being studied.
Signs + or - or subscripts may be entered all on the same line; S2O32- can be entered as S2O3^2-, the symbol, ^, is not required if the sign is +/- one. Use comas to separate the reactants, for example H20, Cl- , Na+ (the order does not matter)
Reactants are
(b) Write a balanced net ionic equation for the reaction (“the clock”) used to measure the rate of the reaction being studied. For the arrow towards products use --> and make sure to balance it.
net ionic eq =
(c) Give the reactant and/or product in (b) that was responsible for the solution turning BLUE in the presence of 0.1% starch solution.
(d) From the experimental time data given above, determine the rate of the reaction in mixture 1 . (please use the correct number of sig figs)
(i) The concentration of S2O32- in the reaction mixture is = M.
(ii) Rate1= M/s
(iii) What would be the rate constant for the reaction mixture 1, calculated from the rate law we found in experiment number 4(For this part use the rate law from your report), for the concentrations use the table give above . k1 = M-1 s-1
(e) For the reaction mixture5 where a catalyst was included in the reaction mixture how much faster was the rate of the reaction (use two sig figs for your answer
Im confused on d and e
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