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Observation for a lab report on density
Density measurement experiment
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Purpose: Learning the concept of density by measuring mass and volume. Finding which substance is the most dense by comparing different substances.
Background: The density of water is 1 g/mL. In order to find density, you must do mass divided by volume. You find solid volume by multiplying the length by width by height or by using displacement. You find mass by weighing the substance. In previous experiments, it is seen that alcohol dissolves faster than water.
Hypothesis: If the density of three substances is found, then the density from greatest to least of them will be: salt water, water, alcohol. This is because salt water is a mixture of 2 substances, which shows that there is more matter within the substance. Alcohol dissolves faster
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Take your data packet and pencil, then go to your lab station with a lab partner.
2. Take out a triple beam balance, graduated cylinder, long pipette, beaker, a wooden dowel, calculator and a centimeter ruler.
3. Find the mass(weight) of your graduated cylinder using the triple beam balance, and record it in your data packet. This will be the same for all liquids.
4. Go to the supply cart with the graduated cylinder and long pipette.
5. Fill up your graduated cylinder with 40 milliliters of alcohol using the long pipette, and record the volume in your data packet. This will be the same amount for all liquids.
6. Take your graduated cylinder and long pipette back to your lab station.
7. Find the mass(weight) of your graduated cylinder, now with the alcohol in it, using the triple beam balance, then record it in your data packet.
8. Subtract the mass of the graduated cylinder from the mass of the graduated cylinder and the alcohol to find the alcohol’s mass. Record it in your data packet.
9. Using your calculator, find the density of the alcohol by dividing the mass by the volume(40 mL). Record it in your data
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Drop a wooden dowel into your graduated cylinder. Wait for it to settle in the liquid, and measure the float height by measuring from the top of the liquid to the top of the dowel using a centimeter ruler. Record it in your data packet.
11. Clean out your graduated cylinder by dumping out your alcohol and rinsing it out in the sink.
12. Repeat steps 4 - 11 with salt water.
13. Fill your beaker with water from the sink.
14. Repeat steps 5-11 with water.
15. Make sure that your long pipette, beaker, dowel and graduated cylinder are all clean.
16. Put the triple beam balance, graduated cylinder, long pipette, beaker, a wooden dowel, calculator and a centimeter ruler away in their right spots.
17. Go back to your desk with your pencil and data packet.
Observations:
Alcohol
had a very strong smell(like a doctor’s office), liquid, felt wet, transparent
Water
no apparent smell, transparent, felt wet, liquid
Salt Water smelled like the ocean, liquid, wet, slightly sticky, cloudy but not completely opaque
Data:
Data Table
The Density of Liquids
Liquid
Mass of Graduated Cylinder (g)
Mass of Graduated Cylinder + Liquid (g)
Mass of Liquid
Half fill the ... ... middle of paper ... ... e data quality. Furthermore, using a graduated cylinder with markings below the 100 mL line would have allowed for more accurate measurements of the initial volume of air in the graduated cylinder.
When the liquid level is above the calibration line on the pipette, remove the bulb quickly and put your thumb or index finger over the pipette. Carefully “roll” finger to the side and allow the liquid to drop until the meniscus is level with the mark. Then hold the pipette over the flask to receive the liquid and remove the finger. Allow the liquid to drain out.
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Regarding the densities of Coke and Diet Coke, I believed that the density of coke would be greater than the density of Diet Coke. Because the content of Coke contains more sugar than Diet Coke, it would contain more mass and since density is mass dependent, Coke would be denser than Diet Coke. From the results of the experiment, there was a slight difference between the densities of Coke and Diet Coke. The measurements obtained from the pipette and the graduated cylinder demonstrated that Coke is denser than Diet Coke while Diet Coke was shown to be denser than Coke using the burette. With the pipette, the average density of Coke is 1.02 and the average density of Diet Coke is 0.99. With the graduated cylinder, the average density is 0.976968 and the average density of Diet Coke is 0.95. With the burette, the average density of Coke is 0.99 and the average density of Diet Coke is 1.0. Among the three instruments, the most precise was the graduated cylinder and the most accurate was the volumetric pipette. Since density is defined as mass/volume, changing the volume of Coke or Diet Coke would have changed.
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