Density Verification Lab Report

Density Verification Lab
Objective:
To determine solutions the different densities of regular and irregular shaped solids, pure liquids, and solutions.
Summary of Procedure:
I. First off all safety protocol and procedures should be followed and in place to begin the lab. First a solid shape is obtained from the lab cart at the front of the classroom. Locate and record its identification number. Then with a ruler, provided by the instructor, the physical dimensions must be determined (ex: length, width, height, and radius) of the solid to the nearest 0.2mm. From the physical dimension, the volume should be calculated as well. Determine the mass of the regularly shaped solid to at least the nearest mg. From the mass and volume, the density of

Next, is the verification and determination of pure liquids. A clean and dry a 25mL graduated cylinder must be gathered from the lab cart, weigh the dry cylinder to the nearest mg and record the data. Add distilled water to the cylinder making sure the water level is at above the 20mL mark but below the 25mL mark. Determine and record the temperature of the water in the cylinder. Then, reweigh the cylinder to the nearest milligram. Calculate the density of the water then compare the measured density of the water with the value from the handbook for the temperature of this lab experiment. Now grab an unknown liquid and record the ID number and determine and verify the density of the unknown liquid. The same method is to be used as described for water.
III. Prepare solutions of solutions of sodium chloride in distilled water consisting of the following percentages by weight: 5%, 10%, 15%, 20%, and 25%. Prepare 25mL of each solution. You do not have to prepare a 100g of each to be able to use the percentage composition. The weight determination of the solute should be to the nearest milligram. Just as determination of density for the sodium chloride should be recorded. Also, record the temperature of each solution while determining the

Density of solid
Calculated Volume of Solid=L·W·H Ex: 15.7L·8.3W·2.5H=325.77
Density= mass/volume Ex: 232.00m/325.77v=51.28g

II. Density of Pure Liquids
Mass of graduated cylinder (GC) =63.07 Mass of cylinder plus water (CW) =87.07
Volume of water= CW-GC=X (Ex: 87.07-63.07=24.05)
Density= mass/volume Ex: 24mL/24.0=1
Temp=23.8℃ Handbook Density= 0.099732
Mass of cylinder plus liquid (ML) =85.127
Volume of liquid=ML-GC= X (Ex: 85.127-63.07=22.057) Density= 24mL/22.1=.09190

III. Density of Solutions
Mass of empty cylinder (ME) = 89.294 Mass of cylinder plus liquid (ML) = 114.320
Formula: ME-ML=Density Measured (DM) Handbook Density= (HD) Density=Mass/Volume
Percent Error: │O-A│×100% Ex: │DM-HD│×100% A HD

Conclusion:
In this density verification lab, it was learned and determined how to obtain the different densities of objects in liquid and of pure liquids. The density of sodium chloride was also determined by using percentage solution. The formulation of D=M/V was used. It was determined that the densities that were calculated (ex: 22.1/24mL= .09190) compared to the handbook density values varied slightly (handbook density value =0.99732).