# Measurement of density of solids and liquids lab report Then use this density to identify the unknown material analyzed. For best results, repeat steps 1. The densities of Al and brass have already been determined. Transfer all the pellets to the beaker, and measure the mass of the beaker and pellets.

## Measurement of density of solids and liquids lab report

Finally, differences in density are useful for separating components of a complex mixture. The predominant direction of water flow is determined by the concentration of the solutes non-water molecules inside and outside of the cell. Using the ruler, measure the dimensions diameter and height of each cylindrical object. Which was most precise? Then slide across that row to '0. Now that you understand the concept of density, let's take a look at two protocols for accurately determining the density of a liquid and a solid. Use a buret funnel to add 45 mL of liquid ethanol to the volumetric flask. Use the three sets of mass and volume measurements to calculate three density values for water. Transfer all the pellets to the beaker, and measure the mass of the beaker and pellets. Density of the cylinder is found by pycnometry. The balance should read zero. One night, my friends and I decided that we should work on a chemistry lab report together. Table 2 lists results for the determination of the density of a sample of zinc metal using a mL graduated cylinder and the liquid displacement method.

Tossing it in can break the bottom of the graduated cylinder. However, note that your best-fit line might not pass exactly through the origin 0,0 due to experimental error — but it should be quite close. One direction was formed by a group of boys from London in Also, density can be described as the measurement of how compact a substance is in a given space.

### Methods used to determine the density of a solid material

Your unknown material is one of the substances listed in the table below. Mass can be measured with scales or balances, and is expressed in grams or kilograms. Thus, density can be used to identify an unknown pure substance if a list of reference densities is available, and the experimenter can choose a convenient amount of substance to work with when measuring density. Precisely measure this volume of water. Record the mass of the zinc pellets. Michael Evans — Georgia Institute of Technology The ratio of the mass of a substance to its volume is known as the mass density or, simply, the density of the substance. Please put disposable pipets and any broken glassware in broken glass containers, not the trash can. This mixture is then subjected to centrifugation — the spinning of the mixture at high speed to generate a "centrifugal force" that will lead to the formation of a concentration gradient of the molecule. Precisely measure this volume. The measured density is the ratio of the measured mass to the volume indicated on the flask. Review Questions Whole degrees are listed down the left hand side of the table , while tenths of a degree are listed across the top. Scientists theorize that this is possible because it is such a small molecule or because there are special gap or pores that allow water movement through the cell membrane. For example, because gold has a higher density than many other cheaper metals, calculating the density of a gold coin is a quick and inexpensive way to test for its purity. Add approximately 10 zinc pellets to the graduated cylinder.

Densities were calculated by dividing the measured mass by The balance should read 0. The average measured density was 0. Table 2, in particular, demonstrates that density is independent of the amount of substance studied.

Rated 10/10 based on 93 review