Physical Science

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Term Paper Title	Physical Science
# of Words	638
# of Pages (250 words per page double spaced)	2.55

Physical Science

2-28-99

Purpose: To determine which of the two acids is stronger by adding a base to an acid until it neutralizes, then determine what the unkown is.

Background Information:  To do this lab, you need to know what most of the words mean. An acid is a substance that produces hydrogen ions in a solution, to identify an acid the pH is under 7. A base is a substance that produses hydroxide ions in a solution, and to identify an base the pH level needs to be over 7. A pH measure of hydronium ion concentration in a water solution; it is measured between 0-14. The way you tell neutralization occurs when the indicator turns a different color and stays that same color.

Procedure: 1) Get a test tube and place five drops of acid in it.
                   2)  Take the test tube and ask the teacher carefull to put one drop of phenolphthalein.
                   3)  Take the NaOH bottle and place drops in the acidic test tube until the color
                        completely changes.
                    4)  To figure out the point of acid becoming neutral, take the number of what you got when it
                          and subtract one.
                     5)  Record the results on the data table.
                     6)  Drain out your acid in the sink and clean the test tubes.
                     7)  Follow all steps again until all of the tests are done twice.

Hypothesis: I believe the H2SO4 will be a stron acid.  At the end of this lab, I believe I will be able to tell the unknown because it would be close or it will for sure take the same amount of drops as H2SO4 or HCL.

Data:                      1st     2nd       Ave. drop
           HCI                3        3               3
           H2SO4          26      24             25
           Unkown #2    49      47             48

Data Analysis:

                      90
             80
                      70
      # of          60
     drops        50
                      40
                      30
...

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