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Polar or Non-Polar Solutes Lab

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2.2 Lab - Identifying Polar and Non-Polar Solutes
Do Not put any of the lab materials into your mouth!

Remember - Lab Rules Apply - No Goofing Around

Materials: plastic tray with sample wells, water, forceps, toothpicks, pipette

There are enough materials for everyone to do this lab. As partners you share the tub materials, however each of you uses a plate to evaluate the solutes.

Solutes to Test: Pick up the 4 color coded solute samples from the Teacher Demo Table. These have to be shared by you and your partner and students from other classes. Do not put water into the colored sample containers. You use the forceps to take just one granule out to place on your specimen plate. When finished with the samples they are to be returned to the Teacher Demo Table and placed in the correct location.

Question addressed in this lab: Are these unknown solute samples polar or non-polar?
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An example of a constant in this lab is...

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Complete the "then" portion of the Hypothesis:
If the unknown sample is polar, then the sample will ...

Use your pipette to add water to the sample wells instead of a water bottle.
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Your results for #1 Unknown Solute (blue cap)

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Your results for #2 Unknown Solute (pink cap)

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Your results for #3 Unknown Solute (green cap)

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Your results for #4 Unknown Solute (yellow cap)

Cleaning specimen plate:
1st - use a paper towel to wipe the substance(s) off of the plate into the trash can - don't put them in the sink
2nd - dry the plate and return it to your tub ready for the next class

Improve the validity of your results by increasing the "Sample Size". One way to do this is to include your classmate's results. As instructed by the teacher, collect data from the whole class. Add your individual data to the table along with the class data.
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Complete the table with your results and the results from the class prior to graphing the data.

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How did your individual results compare with the majority of the class results for Unknown Solute #1?

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How did your individual results compare with the majority of the class results for Unknown Solute #2?

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How did your individual results compare with the majority of the class results for Unknown Solute #3?

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How did your individual results compare with the majority of the class results for Unknown Solute #4?

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Were the results determined by a quantitative or a qualitative procedure?

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* Graph and Analyze the Class Data * Complete the graph by filling in the X axis label * Make a scatter plot graph using the data from the class google sheet

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The independent variable in this experiment is

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Explain whether the class results show the possibility of “experimenter error”. If yes, be sure to refer to the specific data.

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Rate your class (1 to 5 scale) on the accuracy of the class results.

Clean up
  • Everyone helps with cleaning up.
  • Be sure to wipe your table with a sanitary wipe.
  • Be sure all your materials in your tube have been wiped off and returned to the tub for the next class.
  • Do not use the wash station to clean your plates. You are to use paper towels to clean the plates.
  • Be sure you have returned your four unknown samples to the correct location.
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When water is the solvent in a solution we call it aqueous.

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Air is an example of an homogeneous mixture of gases.