Water, Ph, And Buffers

738 Words Apr 27th, 2016 3 Pages
Water, pH, and Buffers
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 that sunk to the bottom of the beaker and I and a couple that floated on top of the water
Data Table 2. Paper Clips Needed to Break Surface Tension.
Estimation
Result
115 Paper Clips
210 Paper Clips
Data Table 3. Drops of Water.
Estimation
Result
27 Drops of water
38 Drops of water
Questions for Part I, Part II, and Part III
A. How did the experiment in Part I demonstrate surface tension? Use your experiment observations when answering this question.
Because there is surface tension the water molecules will adhere together to create a skin sheet that can hold the horizontal needle up. The vertical needle breaks through the sheet. If the horizontal needle was wet and to tried to get the needle to float it would not do so. The needles that were dropped horizontally that did not touch the water horizontal would not float because part of the needle is already sinking before the rest of the needle hits the water.
B. 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…

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