1)What effect does doubling [SO8^2-] have on the rate? By what factor (experimen
ID: 821789 • Letter: 1
Question
1)What effect does doubling [SO8^2-] have on the rate? By what factor (experimental, not rounded to a whole number) does the rate increase? Hint: Rate2/Rae1=?
2)What effect does doubling [I^-] have on the rate? By what factor (not rounded) does the rate increase? Hint: Rate3/Rate1=?
3)Calculate x and y and write the rate law for the reaction. Give your experimental values of x and y (such as x=1.2, y=.91), not ideal values rounded to whole numbers.
4)From your experimental rate law, calculate the value of the rate constant k for each experiment and give the average value. Use your experimental values of x and y. Since this can give awkward units, we will assume the units of k are M^-1s^-1 (the case when x and y=1).
Explanation / Answer
I think this question is part of the iodine clock reaction experiment. I´m using data from a previous experiment to explain you how you can answer the question with your data.
From a previous experiment
The objective of these questions is that you find the values of the relation of the speed of the reaction.
Rate of reaction theoretically goes like this:
r = - K * Ax * By
Our particular case
r = -K * S2O8x * Iy
Now let´s answer the question. What happen when you double the concentration of S2O8 , to answer this question you have to look for two experiments where the concentration of the other specie (I) remains constant in order to clearly see what will go on when you double the concentration. Luckily for us experiment 1 and 2 will do the job (in real life not always you will find the concentration doubled without changing the other specie concentration)
The hint that comes in the statement says everything you have to do.
Rate 2 / Rate 1 =3.4x10-5 / 1.7x10-5 = 2
The rate increases by a factor of 2 in this example.
That´s the way to do it, now you can put the numbers you got
Experiment S2O8 (M) I (M) Rate of Reaction 1 0.05 0.05 1.7x10-5 2 0.1 0.05 3.4x10-5 3 0.05 0.1 3.6x10-5Related Questions
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