i've built a concentration sensor for a school project. i even drew a calibration curve of the voltage (on the y axis) vs the concentration of the solution (on the x axis). therefore sensitivity will be measured in Volts mol^-1 dm^3.
i've got a positive correlation between the two. however there were two times that i took the readings. the first time i calculated the sensitivity, it came out to be 3 V mol^-1 dm^3. the second time i took another reading, i got a much steeper slope with sensitivity 20 V mol^-1 dm^3.
which is more sensitive? the one with the higher value of sensivity or the one with the lower level of sensitivity? could you explain how you got to the conclusion?
2007-01-20 21:09:29 · 2 answers · asked by amandac 3 in Science & Mathematics ➔ Physics
What type of sensors did you use - were they made of Cu.
After the first use, there will be a layer of copper oxide on the probe which is a semiconductor and will have a very variable resistance.
This will make the sensitivity of your machine variable.
You quote 3V and 20V /mole. Did you use the origin of your graph to get these figures (static sensitivity) = or did you plot a number of results and get the slope from them (dynamic sensitivity)
If you now have to write up your results, but can not get stable readings - use the above ideas to explain the problem you have as part of your report.
Commercially we use a dropping Mecury Cathode so that the electrode is always clean and untarnished.
2007-01-24 05:03:30 · answer #1 · answered by Rufus Cat 4 · 0⤊ 0⤋
assume u are producing a robot
and asking some1 else for a manual
is it logical
2007-01-21 00:03:11 · answer #2 · answered by come2turkey:) 2 · 0⤊ 0⤋