Ice, Ice, Acid

[da da da d-d da-da, da da da d-d da-da (da-DA) repeat]

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Problem ( Question )

Does the amount of acid in water affect the rate at which it freezes at?

Hypothesis ( Prediction )

I think that the liquid with the most amount of acid will have the largest difference between it and normal water.

Research ( Information Gathering )

  • Which fruit is the most acidic?

Answer: The lime is the most acidic fruit of all the fruits. The longer a lime has been off its home tree, the more acidic, though I don't know why.

  • How do you tell whether a liquid is an acid or a base using a pH meter?

Answer: use the pH meter as directed and look at the results and if the pH is 7, then it is a neutral, if it is 7.1 or higher, then it is a base, and lastly, if the pH is 6.9 or below, then it is an acid.

Materials (What You Need for the Experiment)

  • 6 bowls
  • Beaker( metric )
  • Stirring sticks(2)
  • 7 tablespoons of lime juice
  • tablespoon
  • teaspoon
  • freezer at 0 degrees Celsius or below
  • Digital pH meter
  • Calibration standard(s) of buffer powders
  • Deionized water or D.I. Water
  • Infrared laser thermometer
  • Probe and meter thermometer
  • journal and pencil

Procedure ( How to do the Experiment )

  1. Set up, calibrate*, and test the pH meter
  2. Measure 5 tablespoons of normal water into each of the 6 bowls using the measuring cup.
  3. Label each of the six bowls in consecutive numbers.
  4. Follow the table below to add proper amounts to the water in the bowls.
  5. Take bowl number 1 and put it in the freezer set to 0 degrees Celsius or below.*
  6. Look at and take the temperature of the bowl every 30 minutes and record the results in your notebook or on a piece of paper
  7. Once the water in the bowl is completely frozen, take it out.
  8. Repeat with the other 5 bowls.
  9. Then compare al the results after you've finished all of the bowls.

  10. * as long as the temperature stays in close range from where you started, your results will be accurate

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Variables (What Happened in the Experiment)

  • Independent Variable

The amount of water in each cup or bowl

  • Dependent Variable

The time for the liquids to freeze

  • Controlled Variable

The amount of lime juice in the water

Results(The Outcome of the Experiment )

Conclusion( Was My Hypothesis Correct ? )

my hypothesis was not correct, the liquids that differentiated the most from bowl 1 were bowls 3 and 4. If I were to do this experiment again, then I would change the types of liquids I tried. One example is that I could use different types of water such as distilled water, deionized water, and normal water.

By: Charli Henn