Here Is A Question About Chemistry That Involves Equilibrium Constant And Standard Deviation?
April 27th, 2009
An analysis of a series of repeated measurement produced an equilibrium constant of 4.76 with a standard deviation 0f 0.41. Explicity state the analytical interpretation of this standard deviation with respect to the measured equilibrium constant.
Entry Filed under: Equilibrium Chemistry
1 Comment Add your own
1. Dietrich W | April 27th, 2009 at 10:54 am
On a 95% basis your K has the Confidence Interval [K- 1.96*s/sqrt(n); K+1.96*s/sqrt(n)]. The CI is dependent on sample size n ( sqrt is square root) but your standard deviation seems too high. On the other hand measurements of K values are faulty because of the law of error propagation. Every imprecise determination of a concentration adds to the standard deviation and result in quite high standard deviations.
You should do further measurements because the value for K you obtained is of no use.
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