Trial 1: For the first trial the mass of solid was 38. When vapor pressure becomes equal to the atmospheric pressure of room, that is 100. Data for determination of the density of water: Trial Mass of empty flask and stopper Mass of full flask and stopper Mass of water Initial volume Final volume Volume of water Density 1 46. The flask and rubber stopper were reweighed, and the difference between the intial and final masses was the mass of the water. Calculate the mass of the liquid for each trial. Chemistry Lab report by Determining Unknown by Finding it's Boiling point And Density.
I also believe that the unknown substance will have a moderately high viscosity because it is very thick and coats the walls of it's container. Steps 1-7 were repeated with unknown liquid. Hildegard Peplau,is born in Reading, Pennsylavania in 1931. My results for water turned out fairly well. Discussion: I don't believe that I had any substantial errors, But I did spill some of my substance on my hand while I was pouring it back into it's container.
To determine the volume of an object by submerging it in a liquid of known density. The unknown liquid have colorless and some identical odor characteristics. If a solid is irregular in shape such as a wood chip, then you would need to use calculus to calculate its volume, and the calculation could become very difficult, depending on the shape of the object. English: Viscosity demonstration, the bottom subst. The rubber stopper was needed to insure no water would evaporate from the flask. Mass and Other Considerations The final possible source of error is your measurement of mass. The Erlenmyer flask was then filled with about 30 mL of deionized water dispensed from a buret.
Now let's calculate the densities of the two liquids using the following given data. So the ruler you use to take measurements introduces a possible source of error, since your measurement will only be as accurate as your measuring device. Of the solid by the volume of the solid calculated above. If the temperature in the lab was not 25°C, the true values of the density of the unknown liquid may have differed from the literature values for 25°C. Trial 2: In trial two for water and solid I got 55. Which feels the greatest buoyant force? Problem: What is the relationship between water pressure and depth of water? This process was performed three times in order to eliminate any error. I subtracted the intial amount of liquid in the buret from the final amount of liquid in the buret.
Let me explain this in an elaborated way. When given an unknown substance, there are only a few ways to determine what it is. Just note down the numerical values provided and you can solve the question putting these specific values in the formula of density. Notable exception Hg Mercury with a density of 13,6 on which both iron and lead float! Then we were to find the density of an unknown liquid and find out what the substance was by matching its density with densities of substances listed in our packet. Use Archimedes principle to determine the liquid density. A hydrometer is basically a sealed tube which is narrow at the top and is weighted with a dense material such as lead at the bottom.
One way is to measure its density at a given temperature. C but there was less temperature in room. A sample equation would be 76. How would you determine the proper number of significant figures of a liquid using a graduated cylinder? This difference was how much liquid was dispensed. My hypothesis is based on that the substance has a very oily texture, it is clear, has no smell, and it has a substantially high viscosity. This gave me an answer of 31.
Can Just one measurement be considered accurate? Divide the mass of the liquid calculated above by the volume of the liquid. This experimental determination requires two important measurable quantities which are mass and volume of the selected piece of matter. Hang the metal cylinder on the hook above the pan so that the metal is suspended and submerged in the water without touching the sides. Few drops remain in burette while filling up the beaker. The pycnometer must be empty and dry before conduct the experiment. Learn to calculate the density of an unknown liquid from knowing its mass and volume using a graduated cylinder and triple beam balance.
The viscosity is very high in this substance because when I poured some in the graduated cylinder it poured and trickled down the sides slowly. Carefully determine the mass of each with the pan balance. I simply subtracted the mass of the empty flask and rubber stopper from the mass of the full flask and rubber stopper. This includes the devices like Hydrometer, Dasymeter, Coriolis etc. Trial 2: In trial two i calculated the mass of the liquid alone was 10.
Divide the mass of the solid by the volume calculated above. Density of an Unknown Liquid Essay Mass of graduated cylinder and liquid grams 30. The neck of pycnometer was being picked up with papers between the fingers to avoid the expansion of pycnometer due to heat of the hand. Actually, when we increase the pressure, it brings about an increase in density as well and when we increase the temperature, the density gets decreased. Talking about the density, it can be different with different objects and it may be relevant to buoyancy or purity and even other such factors.