[CHM 111] Lab 3

[Andrew J. Pounds]

On 10/3/19 12:40 PM,
> Dear Dr. Pounds,
>
> I hope this week has gone well for you. I was wondering what the 
> method is to pick our best trials. Do we view their deviations from 
> the average then select the trials with the least deviation for our 
> molarity calculation in Lab 3? Or do we first view the calculated 
> molarities and choose the three closest together? Any assistance in 
> this matter is appreciated.
>
>
Alright -- you had 5 trials -- we want to find the three trials that 
give the best precision.  For the NaOH lab, calculate all five 
molarities.  Then there are 10 different combinations to try.

Trials....

1,2,3

1,2,4

1,2,5

1,3,4

1,3,5

1,4,5

2,3,4

2,3,5

2,4,5

3,4,5


For each of the "trial groups" above compute the average and 
deviation.   For the trial group that gives you the LOWEST AVERAGE 
DEVIATION, record the molarity as you "average molarity" for the NaOH 
solution and use that molarity in the KHP lab.

In the KHP lab determine the %KHP for each trial, and then repeat the 
procedure above for your five %KHP trials to find the trial group that 
gives the LOWEST AVERAGE DEVIATION in your %KHP.  For that trial group 
record the average %KHP as the result for your unknown.

Does that help?