A conductivity device is used to measure the conductivities
of electrolytic solutions. Electrodes on
the device are dipped into a solution, and the solution's conductivity
is registered on the display.
Using a Conductivity Device
Remove the protective cap from the device. Check to see that
the electrodes are clean. Rinse the electrodes with distilled
Video: Rinsing the electrodes ( 866K )
Dip the device into the solution. Do not immerse it above
the raised dash mark near its base.
Turn on the device. Gently swirl it in the solution. Record
the number shown on the display.
Sliding switch to "on" position with thumb
When finished, rinse the electrodes with distilled water,
dry the device, and replace the protective cap.
Reading the Display
Multiply the reading from the conductivity device by the number
shown in the upper left corner of the display (either 10 or 100).
This value is the conductivity of the solution in units of microsiemens.
The higher the value, the more conductive the solution.
The device is able to register from 0 to 199. If the conductivity
of the solution is greater than 199 times the appropriate
multiplier, the device will register a "1" on the far
left of the display.
You have been given an unknown solid, and you know that it is
either NaCl or sugar. Devise an experiment that could distinguish
between these two substances. No taste testing allowed!
What is the conductivity as measured by this conductivity device (including units)?
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