Measuring density will be almost the same as you did in the previous lab. Safety Many organic liquids are toxic and flammable, so you should exercise care whenever handling them. Do not breathe the vapors.
I simply subtracted the mass of the empty flask and rubber stopper from the mass of the full flask and rubber stopper. A sample equation would be This same method was used to find the volume of water in the flask. I subtracted the intial amount of liquid in the buret from the final amount of liquid in the buret.
This difference was how much liquid was dispensed. An example would be In order to find the density, I simply divided the mass found by the volume found. To find the average density, I added the three densities I found, then divided that total by three to find the average.
The equation for the water was 0.
Precision was found by taking the absolute value of the highest density minus the lowest density, dividing that difference by the average density, and then multiplying that answer by For example, the precision for the water was found by this equation: This gave me an answer of Finally to find the error, I found the absoulte value of my measured density minus the actual density.
With my data, my equation for the water was 0. My accuracy was very high, but my precision was not quite as good.
A precision of However, my accuracy turned out to be very high, as my error was very low. It seems that I was lucky to have gotten such good accuracy with bad precision.
My data from the unknown substance turned out incredibly well. My precision was 1. I assume 0 ppt would be perfect precision, so 1. My accuracy was also high, as my error was only 0.
Some of my error can be accounted for by a leak in my buret. A few drops of the liquid inside seemed to drip out from right above the bottom where it was supposed to come out.
Also, I may have gotten finger prints on the flask, which would have added a slight bit of extra weight that could throw my calculations off. Therefore, I should be even closer to the actual density.
In the end, my data was fairly accurate with the actual data, so the experment was a success. This academia was first published 25 Sep and last revised 13 Feb He scrapbooks yonder every minute or three.
Next 18 Sep Relative density of a substance is defined as the ratio between the density of the substance to the density of water at 40C. Relative density is also known as specific gravity.
The relative density of a substance is a pure number without any unit.
Watch how simple it is to measure density on your METTLER TOLEDO laboratory balance. The Density Kit enables you to determine the density of solid, liquid, porous and viscous substances.
With step-by-step instructions and automatic calculations, the whole process is easy. Nevertheless, the method of using pycnometer to measure the density of the liquids and water displacement method for the irregularly shaped solids yields accurate and reliable results.
REFERENCES 1. Gallova, J. (). In this lab, you will make some observations of floating objects, determine the density of 2 liquids, and examine some real life applications of what you have learned.
Denstiy Of Solids Students will be able to calculate the densities of different materials and recognize that density is one of the most important properties of matter. Density is a property of all matter, including solids, liquids, and gases.
The density of a substance is a measure of how The density of a substance is a measure of how “tightly packed” it is, or how much matter is present in a certain volume of the substance. Although density is an intensive property, the density of matter can be influenced by temperature, thus, when calculating density it is also essential to record the temperature at which the measurements .