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Diaper Testing

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					Lab #                 Diaper Testing (Oh, Baby!)              due: ______________




  I.       Introduction:
           Problem A: Which diaper will be able to hold the most liquid?
           Problem B: Does every diaper have the same degree of purity in the sodium
           polyacrylate it contains?
           Research: How does a diaper function? What would you think would prove
           which diaper is the best? How will you test this? What is sodium polyacrylate
           and how does it work?

  II.      Hypothesis: If we test for the amount of sodium polyacrylate in diapers, then
           I think __________ will have the most because ______________________.

  III.     Materials and Methods:
           Materials: different brands of diapers, gallon zip lock bags, plastic cups, scales,
           water, graduated cylinder
           Sketch:
           Procedure A:
               1. Open up a diaper and cut down the middle of the composite fiber part so
                   that it can be separated from the plastic lining.
               2. Put all the cotton into a gallon Ziploc bag and make sure it is closed
                   completely.
               3. Shake the composite fiber until the sodium polyacrylate powder is
                   shaken out and is at the corner and bottom of the bag.
               4. Carefully remove all the cotton from the bag and add the sodium
                   polyacrylate powder to the cup for that brand of diaper. Don’t put it in
                   the cup for the other brand!
               5. When everyone has finished this step get the total mass and divide it by
                   diaper. Make a bar graph showing the average amounts per diaper
                   brand.

        Procedure B:
               1. Measure 0.5 grams of sodium polyacrylate from one of the brands and
                  put it into a plastic cup.
                2. Filling a graduated cylinder with 100 mL of water, begin adding tap
                   water in increments using a pipette. KEEP TRACK OF HOW MUCH
                   WATER YOU ADD!
                3. After the saturation level for the powder has been reached (it can
                   absorb no more water), record total amount of water absorbed.
                4. Record all your data on the overhead, then get the average saturation
                   amount for each diaper and make a bar graph showing the data per
                   diaper brand.




IV. Results:
Data Table for Problem A:   Amount of Sodium Polyacrylate per Diaper Brand
   Diaper Brands          No. of Diapers       Total Mass of         Average Mass of
                             Tested         Sodium Polyacrylate Sodium Polyacrylate




Data Table for Problem B: Saturation Amount of Sodium Polyacrylate per Diaper Brand
Diaper Brand         Saturation       Total Number       Total Saturation        Average
                                                         Amount for all of      Saturation
                    Amount in my       of Diapers         this brand of      Amount for this
                    group’s trials       Tested              Diapers         brand of Diaper




         Analysis of Data:
         Graph for problem A: Explain which is the better diaper brand.
         Graph for problem B: Which brand had the better quality absorbent?

   IV.       Conclusions:
         How did performing this lab allow you to solve problem A? To solve problem B?
         Explain how the data either supported or rejected your hypothesis.
         Give two more criteria that could evaluate diapers. What are possible experiments
         you could perform on diapers to test for those criteria?
         What is another experiment you could perform with sodium polyacrylate?
         Explain two more ways you could use sodium polyacrylate in a real life situation.
         What are three possible errors that could invalidate your data?
         What are three possible improvements you could make to this lab?
         What did you like/dislike about doing this lab?
         What is the easiest/most difficult part of doing this lab?

				
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posted:4/22/2012
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