Density Lab Report

Density is defined by its crowdes per unit intensiveness, and is most a good deal written in mathematical damage as d = m / vMass is unremarkably granted in gravitational constants, g, and deal is minded(p) in cubic centimeters, g/cm3, or, grams per milliliter, g/mL. Density is non a situation that depends upon the amount of heart and soul present. For example, one gram of hint and one ton of lead have the same minginess. Density similarly does depend on temperature. For instance bleak water system is denser than warm water trumpery is less dense than both. The method utilize for determining the parsimony of a substance depends on the nature of the substance. In this lab the densities of hidden irregularly shaped solids and liquifieds was goaded.Accuracy and clearcutness of the results go awaying be estimated, and attention will be paid to the correct custom of the significant figures. The experiment approach that will be used will give nonice (of) the c ircumstances and strength of the alloy and still determined by measuring these cardinal quantities with a graduated piston chamber and biuret. usea) The niggardliness of surfacesFirst I obtained a standard of unfamiliar admixture. Recording the unknown come in. I used only one guinea pig of metal for this part of the experiment.The unknown metal that I was instructed to use was a chunk, therefore, I used a 50ml graduated cylinder. When victimisation the 50ml cylinder, I filled it with water to ab bug out the 35ml mark. Then preserve the fine volume of water that was added. I placed the cylinder and water on the equaliser and recorded the mass to every 0.1g. I added the metal to the graduated cylinder until the water direct increased by approximately 2.0ml. organism sure to tap the sides of the cylinder to acquittance any air bubbles. I and and so recorded the volume of the water overconfident metal to the nearest 0.1mL.Then recorded the full mass of the cylin der, water and metal. I added much(prenominal) pieces of metal to the cylinder until the water train had increased by 2.5ml. Then I recorded the exact volume of water plus metal and complete mass of cylinder, water and metal. I repeated the appendage twice more. Being careful not to go over the 50ml mark. And recording the information individually time.CalculationsI determined the total volume of metal in the cylinder by subtracting the volume of water from the volume of water plus metal. Then raise the corresponding mass of metal by subtracting the mass of the cylinder and water from the mass of the cylinder, water and metal. I plotted out the represent showing the total mass of metal on the y-axis, and the volume on the x-axis. I found the slope of the grade by taking two ergodic points from the graph, performing the slope formula and conclusion the density. From the table provided, I identified the unknown metal to be eloquent.b). Determining the density of a water/ ethanol mixture.I obtained an unknown solution from the instructor. Then recorded the number of the solution.Then I rinsed a burettete with a little of the ethanol solution, and filled the buret with that same solution. I read the buret level to the nearest 0.05ml. Then weighed an overturn 250ml Erlenmeyer flaskful. I turned the knob of the buret and put approximately 23.4ml of solution into the flask. I read the buret again, to 0.05ml and recorded.Next I weighed the flask and its contents, by placing the flask on the balance and recording the temperature of the solution. I then determined the density of the solution by taking the mass of solution and dividing it by the volume of solution. Repeating the procedure twice more using a clean flask and the same balance each time.CalculationsFor each of the three trials I calculated the density of the solution and determined the mean, average departure from the mean, percent precision and the range. I then drew a calibration hoist fr om the data given on rogue 17 of my Laboratory Manual.DiscussionBased on the value of my density, and based on the literary works values given on rascal 16 of my Laboratory Manual, the unknown metal is silver. The density I had obtained from the slope of the graph was 9.09g/mL. I then compared my density to the chart given, looking for a similar density. The density of my unknown metal was not exact with a particular metal given inthe chart, but I kept in mind that the density of silver can vary depending of the state it is in.Error abridgmentThe possible sources of error in finding the density of the unknown metal and liquid would have to be my consistency passim the experiment. I had approximated with my bare eye and was not consistently exact. Therefore, there was an inaccuracy in adaptation the volume displaced from the graduated cylinder and the biuret.