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The Drop of Water

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Introduction

THE DROP OF WATER Jane Shores Jennifer Nguyen Meika Ellis Science 10 IB Mr. Cooper February 16th '06 1.0 Aim: The purpose of this lab is to determine the volume of a drop 1.1 Problem: How can one, using a 1 ml pipette, ascertain the volume of one drop of water (dihydrogen oxide)? 1.2 Hypothesis: If you fill a 1 ml pipette with water and allow the water to drip through the opening, slowly enough to count each drop, then you can infer the approximate volume of a drop of water because according to the metric system, commissioned by the Academy of Science in 1790, one millilitre of water is equivalent to one gram of water. Therefore, by using weight and the number of drops produced, one can figure out the volume a single drop. 1.3 Variables Independent: 1ml pipette Dependant: The approximate volume of a drop of water Controlled: The size of the drops, the volume of water placed in pipette All of the relevant variables identified in this lab are quantitative. The 1ml pipette is vital to this lab because it is the instrument that we intend to utilize to form drops of water from 1ml of water. ...read more.

Middle

O.54g ? number of drops ? 13 ------------------------ -------- Weight of each drop (g) 0.0415g = Volume of each drop (ml) = 0.0415ml Trial 1 2 3 4 5 Average Weight of drops (g) (+/-0.005) 0.54g 0.43g 0.54g 0.55g 0.56g 0.524g Quotient of weight of drops divided by number of drops (g) (+/-0.005) 0.0415g 0.0331g 0.0386g 0.0393g 0.0400g 0.0385g Approximate volume of each drop (ml) 0.0415ml 0.0331ml 0.0386ml 0.0393ml 0.0400ml 0.0385ml Table two. Approximate mass and volume of a drop of water as produced from 0.5ml of water by a 5ml medicine dropper 5.0 Conclusion Based on our experiment, I can conclude that it is possible to measure the volume of a drop of water by using a medicine dropper. Based on our result, the approximate volume of a drop of water produced by a 5ml medicine dropper is 0.0385ml. However, I believe that a more conclusive experiment to determine the volume of a drop of water would be to use many different instruments, such as a biuret, 10ml pipette and 25ml pipette. In our experiment, it is important to note that despite the best efforts to control the size of the water drops, it is very likely that the drops were varied in size; therefore, the results we achieved are only approximate. ...read more.

Conclusion

Record the number. 6. Weigh the beaker, with the drops of water. Record the weight. 7. Subtract the weight of the beaker from the combined weight of the beaker and the drops to determine the weight of the drops alone. Record the weight. 8. To pinpoint the weight of each drop, divide the weight of all of the drops by the number of drops. Record the weight. 9. Repeat process at least three times. Average results. 5.2 Summary Questions - How does the volume of a drop of water compare to the volume of a drop of other liquids produced by the same instrument? - How does the volume of liquid water drops compare to the volume of solidified (frozen) water drops? o What would the impact be on the volume of the ice if it were frozen in a vacuum? - Does atmospheric pressure affect the volume of a drop of water? - How does the volume of a drop of water attained in the lab compare to the volume of a raindrop? - How does mineral content affect volume of a drop of water? - How varied in size are drops of water produced by the same instrument if equal force is applied? - Does the pressure of the water in the medicine dropper affect the volume of the drops produced by the dropper? ...read more.

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