Hi , I need your help please. I don\'t know how to do this . I posted this quest
ID: 1059697 • Letter: H
Question
Hi , I need your help please. I don't know how to do this . I posted this question before and some sweet person did all this work below but I don't really understand ( i also don't know if it's right)and he also did the GRAPH on paper .I Need the GRAPH on EXCEL PLEASE.
If you kindly maybe type it so I can fill this chart that would be really great ( I just gotta show some work to teacher) THANK YOU
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this was the answer that was posted
Moles Determi- mL Moles nation Nazs203 Nazs203 S2082 remaining remaining time in s time in min consumed consumed remaining Prepare a graph of lnIS20e2-1 vs. time in min, determine the pseudo-first order rate constant k' and calculate the rate constant k.Explanation / Answer
You added 3.0 mL of 0.15 M sodium persulphate (Na2S2O8) to each of the test tubes. The total volume of the solution in each test tube is 12.0 mL. Note that you added 3.0 mL persulphate to each of test tubes 1-5.
Therefore,
moles S2O82- added = (3.0 mL)*(1 L/1000 mL)*(0.15 mol/L ) = 4.5*10-4 mol.
[S2O82-]initial = 0.0375 M
Write down the two equations:
S2O82- + 2 I- ------> 2 SO42- + I2
2 S2O32- + I2 ------> S4O62- + 2 I-
Moles S2O32- = ½*(moles I2 consumed) = ½*(moles I2 liberated) [ I2 is generated instantly by the action of persulphate on KI].
Again moles I2 liberated = moles S2O82- consumed.
Therefore, moles S2O82- consumed = 1/2*(moles S2O32- consumed).
Now, we shall compute moles S2O32- consumed and hence moles S2O82- consumed.
Determination
Moles S2O32- consumed = (volume of S2O32- in L)*(concentration of S2O32- in mol/L)
Moles S2O82- consumed = 2*moles S2O32-
Moles S2O82- remaining = (moles S2O82-)initial – (moles S2O82-)consumed
1
6.0*10-4
3.0*10-4
1.5*10-4
2
5.0*10-4
2.5*10-4
2.0*10-4
3
4.0*10-4
2.0*10-4
2.5*10-4
4
3.0*10-4
1.5*10-4
3.0*10-4
5
2.0*10-4
1.0*10-4
3.5*10-4
Total volume of the solution = 12.0 mL.
Determination
[S2O82-] remaining (M) = (moles S2O82- remaining)/total volume in L
ln [S2O82-]remaining
Time in minutes
Time in seconds
1
0.0125
-4.38
6.30
378
2
0.0167
-4.09
5.26
315.6
3
0.0208
-3.87
4.46
267.6
4
0.0250
-3.69
3.32
199.2
5
0.0292
-3.53
2.16
129.6
Now plot ln [S2O82-]remaining (y co-ordinates) vs time in minutes (x co-ordinates).
Determination
Moles S2O32- consumed = (volume of S2O32- in L)*(concentration of S2O32- in mol/L)
Moles S2O82- consumed = 2*moles S2O32-
Moles S2O82- remaining = (moles S2O82-)initial – (moles S2O82-)consumed
1
6.0*10-4
3.0*10-4
1.5*10-4
2
5.0*10-4
2.5*10-4
2.0*10-4
3
4.0*10-4
2.0*10-4
2.5*10-4
4
3.0*10-4
1.5*10-4
3.0*10-4
5
2.0*10-4
1.0*10-4
3.5*10-4