1)Calculate the rate constant k , given that k ¢ = k ×[I - ]. Include the units
ID: 1026474 • Letter: 1
Question
1)Calculate the rate constant k, given that k¢ = k×[I-]. Include the units and indicate the temperature.
The concentration of KI from the previous experiment =0.4 M . Therefore the concentration of I-1 ionic concentration= 0.4 M. From the previous calculations, we know that k’ = 0.1876 minutes-1.
Therefore, k= k’/[I-1] = 0.1876 minutes-1/0.4 M = 0.469 minutes-1/M.
How do I indicate the temperature?
2)In step 3 of the procedure you added 10 mL of reaction mixture to ~100 mL of iced water. What two effects occur here? Explain how they affect the KI + K2S2O8 reaction.
Practical 15.1 Q Search in Document Homc InsertDesign Layout References Mailings Revicw View +Share Arial AaBbCcDdE AaBbCcD AaBbCcDd AaBbCcDdE AaBbCcDd AaBbCcDdE Paste Normal Style1 Style2 No Spacing Heading1 Heading 2 Styles 3,5 y =-O,1876x + 3.6511 R3 0,98069 2,5 10 15 25 3D 0,5 -1,5 Time (minutes 4) Report the slope of the best fit to the data (including units). What does the slope of the curve correspond to? The slope of the line of best fit of the data is equal to -0.1876 minutes which corresponds-k. The slope can also be calculated by taking into account two points on the straight line such as (2.75,5) and (1.8,10). Therefore, using the slope formula y2-yixz-X-0.19 minutes 5) Calculate the rate constant k, given thatk Include the units and indicate the temperature. The concentration of Kl from the previous experiment =0.4 L Therefore the concentration of I-ionic concentrations 0.4 M. From the previous calculations, we know that k 0.1876 minutes" Therefore, k= k/U11-0.1876 minutes y0.4 M 0.469 minutes YM 6) In step 3 of the procedure you added 10 mL of reaction mixture to 100 mL of iced water. What two effects occur here? Explain how they affect the KI K2S2Og reaction Page 2 of 3 549 Words English (US) .-- Focus 125%Explanation / Answer
1) The experiment is conducted at room temperature ,so the temperature must be equal to the room temperature.If the room temperature was not noted during experimentation then, T=25 degree C or 298K (normal temperature). is generally indicated.
2) Adding iced water on the reaction mixture lowers the reaction temperature,which effects the reaction by decreasing the rate of the reaction and increasing the rate constant K.
Effect of temperature on the rate of rxn is given by Arrhenius equation as follows:
k=A exp(-Ea/RT)
or, lnk=lnA -Ea/RT
where k=rate contant of the reaction
A=pre-exponential term
Ea=activation energy
R=gas constant=8.314J/K.mol
T=temperature(in K)
The ratio of specific rate constant of reaction at arise of 10 degree C is termed -the temperature coefficient-K(T)/K(T+10)
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.