Ice, Ice, Acid
[da da da d-d da-da, da da da d-d da-da (da-DA) repeat]
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
- 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 )
- Set up, calibrate*, and test the pH meter
- Measure 5 tablespoons of normal water into each of the 6 bowls using the measuring cup.
- Label each of the six bowls in consecutive numbers.
- Follow the table below to add proper amounts to the water in the bowls.
- Take bowl number 1 and put it in the freezer set to 0 degrees Celsius or below.*
- 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
- Once the water in the bowl is completely frozen, take it out.
- Repeat with the other 5 bowls.
- Then compare al the results after you've finished all of the bowls.
* as long as the temperature stays in close range from where you started, your results will be accurate
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