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Transcript

Proving Water as a Universal Solvent

Citations

Materials

  • http://howyourbrainworks.net/content/neutral-polar-and-electrically-charged-particles
  • http://chemistry.about.com/od/chemistryglossary/g/Universal-Solvent-Definition.htm
  • http://www.eastpennsd.org/teacherpages/mharned/myfiles/Universal%20Solvent%20Inquiry%20Lab.doc

Materials

Conclusion I

Objective

  • 6 Beakers
  • 500ml of water
  • 500ml of oil
  • 2 spoonfuls of salt
  • 2 spoonfuls of baking soda
  • 4 spoons
  • 1 spoonful of water
  • 1 spoonful of oil

Proving that water is the universal solvent, we conducted this experiment with salt, Baking Soda, Oil, and water. Based on our results we were able to prove that since water is polar, can dissolve polar solutes such as salt and baking soda.

  • The objective of our lab was to prove that water is a universal solvent through the demonstration of it's polar properties, using both polar and non-polar substances.

Two ways we could change the lab to get different results is if we :

1.) Stirred the mixture for more time

2.) If we heated up the solvents before hand.

Hypothesis

If water is a universal solvent due to its polarity, then it will be able to dissolve other polar substances such as salt, and baking soda. If this is true then non-polar liquids, such as oil, will not be able to dissolve into water.

Data Table

Water

Conclusion II

Conclusion IV

Two ways we could change the lab to get different results is if:

1.) We stirred the mixture for more time.

2.) If we heated up the solvents before hand.

Conclusion III

3 errors from the lab:

1.)The solutes were not in the solvent for the same amount of time before being observed.

2.) The temperature of each solvent was not considered or adjusted.

3.) We do not know the effect of inputting more than 1 teaspoon of each solute.

We found that this statement is true because water was able to dissolve salt and baking soda (polar substances) while it was not able to dissolve oil (a non-polar substance.)

Data Evidence

Oil S & Water S

Water is a polar substance because it has both positive and negative charges.

Procedure

Alexandria O'Bard, Sharon Wang, Jane Truong, & Karla Zirkelbach

Period. 2 AP Biology

Procedure Video

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