This activity is meant to prepare students to do the full-length Conductivity Lab.
Salt.Dissolving (9K)
An ionic compound in the act of dissolving in water.

Lab: Exploring Conductivity

In this brief activity you will learn how to use the Vernier Conductivity Probe and the Logger Lite software used to collect data using the probe.

Tasks
  1. Figure out how to measure the conductivity of 100 mL of tap water and 100 mL of distilled water with a sensitivity setting of 0 - 200.
    1. What are you going to do to avoid cross-contamination?
    2. In your lab notebook, write down your procedure and record your numerical results.
    3. Consider whether the probe is guaranteed to read zero conductivity when there are no ions dissolved in the water. In your lab notebook, write down how you would determine what value for conductivity represents zero conductivity.
    4. If only one of the two liquids contains a dissolved electrolyte, then which one do you think it is? Why?
  2. Shortly you will be asked to take data in which you measure the conductivity of solutions with different amounts of salt added to them.
    1. Figure out how to take data for conductivity versus the amount of salt added. Set up the software and write in your lab notebook how to do it.
    2. Figure out how to set up the graph axis so that the maximum number of portions of salt added is 12.
  3. Set the sensitivity on the sensor to 0 - 20,000. Figure out the relationship between the number of portions of salt and the conductivity. Do this by creating a graph of portions vs. conductivity. First, stir the beaker of 100 mL of distilled water (from earlier) with a glass stirring rod. Second, get a tiny bit of salt on the wet stirring rod (just enough to cover the end) then mix it with the water. Third, when you judge that the time is right “Keep” the data point and enter the number of portions you have added so far. Collect data for 10 - 12 portions with a sensitivity of 0 - 20,000.
    1. Write down (in your lab notebook) 2 or 3 pieces of advice for a student who is learning how to use this probe and this software.
    2. Sketch your completed graph in your lab notebook as accurately as you can. Borrow a piece of graph paper if that will help.
    3. Were all of your portions the same size? How do you know? Use your graph as evidence.

Salt.Dissolving (9K)
An ionic compound in the act of dissolving in water.

Lab: Exploring Conductivity

In this brief activity you will learn how to use the Vernier Conductivity Probe and the Logger Lite software used to collect data using the probe.

Tasks
  1. Figure out how to measure the conductivity of 100 mL of tap water and 100 mL of distilled water with a sensitivity setting of 0 - 200.
    1. What are you going to do to avoid cross-contamination?
    2. In your lab notebook, write down your procedure and record your numerical results.
    3. Consider whether the probe is guaranteed to read zero conductivity when there are no ions dissolved in the water. In your lab notebook, write down how you would determine what value for conductivity represents zero conductivity.
    4. If only one of the two liquids contains a dissolved electrolyte, then which one do you think it is? Why?
  2. Shortly you will be asked to take data in which you measure the conductivity of solutions with different amounts of salt added to them.
    1. Figure out how to take data for conductivity versus the amount of salt added. Set up the software and write in your lab notebook how to do it.
    2. Figure out how to set up the graph axis so that the maximum number of portions of salt added is 12.
  3. Set the sensitivity on the sensor to 0 - 20,000. Figure out the relationship between the number of portions of salt and the conductivity. Do this by creating a graph of portions vs. conductivity. First, stir the beaker of 100 mL of distilled water (from earlier) with a glass stirring rod. Second, get a tiny bit of salt on the wet stirring rod (just enough to cover the end) then mix it with the water. Third, when you judge that the time is right “Keep” the data point and enter the number of portions you have added so far. Collect data for 10 - 12 portions with a sensitivity of 0 - 20,000.
    1. Write down (in your lab notebook) 2 or 3 pieces of advice for a student who is learning how to use this probe and this software.
    2. Sketch your completed graph in your lab notebook as accurately as you can. Borrow a piece of graph paper if that will help.
    3. Were all of your portions the same size? How do you know? Use your graph as evidence.
After doing this activity, go ahead and do the Conductivity Lab.
Last updated: Jun 14, 2016       Home