1) Report the slope of the best fit to the data (including units). What does the
ID: 1026468 • Letter: 1
Question
1) 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-1 which corresponds –k’.
2) Calculate the rate constant k, given that k' =k*[I-]. Include the units and indicate the temperature.
The concentration of KI from the experiment is equal to 0.4 M.
3) 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.
8:39 AM Done Practical 15.1 In (V-Voo) versus time (minutes) 3,5 y -0,1876x +3,6511 r' 0,98069 2,5 10 15 25 30 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 e of the line of best fit of the data is equal correspond to? corresponds min ich 5) Calculate the rate ntk.give atK= de the units and indicate the temperature. oftheproceddyou ada -of reactionmixtur o m god water. What 6) In L of iced water. What effects occur w they affect t 7) Com ergoes a first order chemical reaction a equation IA] In After 145 s, 41.2% of A has been consumed a) Determine the rate constant k At t- 145sExplanation / Answer
1) Report the slope of the best fit to the data (including units). What does the slope of the curve correspond to?
The slope can be calculated using the straight line from the above graph in the following way:
Identify 2 points on the straight line:
(x1, y1) & (x2, y2)
Which are (2.75, 5) & (1.8, 10)
Now slope , m = (y2-y1)/(x2-x1) = (2.75-1.8)/(5-10) = -0.19 m-1
Alternatively it can be obtained from the line equation given:
y= -0.1876x + 3.6511, whre it represents y = mx+C, where m is the slope and hence m= -0.1876 m-1
It represents the rate of the reactoon, K in this case. as it corresponds to chane in conc vs change in time.
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