Chemistry Lab: Determination Of Density
Title of the Experiment: determination of densities
Introduction
The density of a sample of matter represents the mass contained within a unit volume of space in the sample. For most samples, a unit volume means 1.0 ml. The units of density, therefore, are quoted in terms of grams per milliliter (g/ml) or grams per cubic centimeter (g/cm3) for most solid and liquid samples of matter.
Density is often used as a point of identification in the determination of an unknown substance. The density of the unknown might be used to distinguish the unknown from a list of known substances. It is very unlikely for two substances to have the same density, and when coupled with boiling point and melting point it adds even more validity to the identity …show more content…
Prepare 50 ml of each solution (you do not have to prepare 100 g of each solution to be able to use the percent composition). Make the weight determinations of salt and water to as accurately as possible.
Using the method described earlier for samples of pure liquids, determine the density of each of your sodium chloride solutions. Record the temperature of each solution while determining its density.
Construct a graph of the density of your solutions versus the percent of NaCl the solution contains. What sort of relationship exists between density and composition?
Use a handbook of chemical data to determine the true density of each of the solutions you prepared. Calculate the percent error in each of the densities you determined.
Discussion
Density is that physical property that determines whether one substance (a solid for example) will float or sink in another substance (water for example). To do this kind of experiment, we cannot have one substance forming a homogeneous mixture with the second substance, so we will choose a metal and water, so that they won’t mix. Rocks have higher density values than water, and so rocks sink to the bottom and the water floats on top. Oil and cork have lower density values than water, and so both float on water. In salad dressing, the oil floats on top of the vinegar, and the vinegar is about 95% water, so its …show more content…
Gettingthe accurate density of the said materials and reagents was determined by using the mass andvolume of the substances. Also, in this experiment the rules of significant figures were applied inmeasuring the weight and volume of the substances. The used of having the different types of liquid was to have a deeper understanding of the different densities of the respective liquids. Also,the different application on how to get the density of regularly-shaped solid and irregularly-shapedsolid were performed. In regularly-shaped solid, the use of metric ruler and beam balance wereapplied, while in irregularly-shaped solid, the use of water displacement method was applied. Thedetermination of densities of different substances was performed to have definite informationregarding different
Introduction
The density of a sample of matter represents the mass contained within a unit volume of space in the sample. For most samples, a unit volume means 1.0 ml. The units of density, therefore, are quoted in terms of grams per milliliter (g/ml) or grams per cubic centimeter (g/cm3) for most solid and liquid samples of matter.
Density is often used as a point of identification in the determination of an unknown substance. The density of the unknown might be used to distinguish the unknown from a list of known substances. It is very unlikely for two substances to have the same density, and when coupled with boiling point and melting point it adds even more validity to the identity …show more content…
Prepare 50 ml of each solution (you do not have to prepare 100 g of each solution to be able to use the percent composition). Make the weight determinations of salt and water to as accurately as possible.
Using the method described earlier for samples of pure liquids, determine the density of each of your sodium chloride solutions. Record the temperature of each solution while determining its density.
Construct a graph of the density of your solutions versus the percent of NaCl the solution contains. What sort of relationship exists between density and composition?
Use a handbook of chemical data to determine the true density of each of the solutions you prepared. Calculate the percent error in each of the densities you determined.
Discussion
Density is that physical property that determines whether one substance (a solid for example) will float or sink in another substance (water for example). To do this kind of experiment, we cannot have one substance forming a homogeneous mixture with the second substance, so we will choose a metal and water, so that they won’t mix. Rocks have higher density values than water, and so rocks sink to the bottom and the water floats on top. Oil and cork have lower density values than water, and so both float on water. In salad dressing, the oil floats on top of the vinegar, and the vinegar is about 95% water, so its …show more content…
Gettingthe accurate density of the said materials and reagents was determined by using the mass andvolume of the substances. Also, in this experiment the rules of significant figures were applied inmeasuring the weight and volume of the substances. The used of having the different types of liquid was to have a deeper understanding of the different densities of the respective liquids. Also,the different application on how to get the density of regularly-shaped solid and irregularly-shapedsolid were performed. In regularly-shaped solid, the use of metric ruler and beam balance wereapplied, while in irregularly-shaped solid, the use of water displacement method was applied. Thedetermination of densities of different substances was performed to have definite informationregarding different