Question

These are Error analysis in Electrochemistry lab:

A) Does an error of one or two hundredths of a volt in your measured cell potential causes a discrepancy between you value for Kd and the value found in literature for Kd? B) if you accidentally added 21 drops of 0.1 M Copper(II)sulfate instead of 20 drops, what effect would it have on your Voltaic cell potential? will it affect on Ecell a little or a lot?

Answer 1

A) Does an error of one or two hundredths of a volt in your measured cell potential causes a discrepancy between you value for Kd and the value found in literature for Kd?

Clearly, since we relate volt to concentration, and this goes to the log of 10, that is, 10^x

so a small amount in change, will be magnified to the 10 power

B) if you accidentally added 21 drops of 0.1 M Copper(II)sulfate instead of 20 drops, what effect would it have on your Voltaic cell potential? will it affect on Ecell a little or a lot?

The solution will clearly have 1/20 --> 0.05 in exces, that is 5% excess

when changing to the e°cell claculation --> log(0.05) = 1.3 so there will be almost a 1.3

E°cell change will be considerably high