Water Buffers Lab

Words: 1392
Pages: 6
Open Document
Jessica Vandeventer
Water, pH, and Buffers
27 April 2016
Purpose/Question-
The lab will show characteristics about water, show how the pH scale works, and teach bout buffers. Hypothesis–
The needle will sink when dropped vertical, and float when dropped horizontal.
The cup full of water will be able to hold 115 paperclips before spilling.
The penny will be able to hold 27 drops of water.
The buffered solution will not change as much when we had the HCl (hydrochloric acid).
Data Tables/ Graphs –
Exercise 1: Water and its Unique Properties
Data Table 1. Needle Observations.
Vertical Observations
Horizontal Observations
When needle dropped the needle hit the water and sunk to the bottom of the beaker.
When the needle dropped I had a couple …show more content…
In Part I, when adding the needle to the water, which approach worked best to balance the needle on the water—the vertical or horizontal placement? Explain your answer.
The horizontal method because the needle has more surface area.
C. In Part II, how did your paper clip estimation compare to your paper clip results?
My estimation was a lot lower then the results showed. I end up with 210 paper clips in the water before it spilled over. I had estimated 115 which is 100 less than my results.
D. In Part III, how were the properties of adhesion and cohesion demonstrated in the experiment?
Both adhesion and cohesion were demonstrated by the water forming a dome on top of the penny. The water formed the dome by the attraction between the water molecules, and adhesion was demonstrated by the between the water and the penny.
Question for Part IV
A. How did this activity demonstrate capillary action? Explain your answer using your experiment results and observations.
Capillary action was show by the red food coloring in the water rising through the celery stack and turning the stalk and leaves green.
Questions part V
A. Compare and contrast the results between the commercial and homemade pH test strips. Which test strips were more accurate? Explain your …show more content…
One way in which this is helpful in science because pH is important to human life. It is also needed to know before mixing chemicals together. The pH scale is also important for testing swimming pools to make sure that it is safe to swim in.
C. What information about a chemical can be inferred from knowing its pH value?
We can infer the amount of H+ Ions in a dissolved solution. If the solution has more H+ Ions we know that it is acidic.
D. If a chemical has a pH of 3, how could you change its pH value to be more basic?
If the pH is 3, we can add water to make it more basic. This is because we are lowering the concentration of H+ Ions.
Questions part VI
A. Analyze the results of your experiment. Did the buffer resist changes in the pH? Explain your answer using your experiment results.
The buffer did resist changes. We can see this by looking at the graph. The buffered solution started at a pH scale of 9.0 and only lowered to 8.0; where as, the unbuffered solution stated at a 7.0 and dropped all the way down to 3.0.
B. Research the bicarbonate buffering system found in the blood stream. Write a paragraph or two discussing this system and how your breathing rate can cause acidosis and
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