Group # 4Section: 2C - PHARMACYDate Performed: Feb. 26, 2015Date Submitted: March 19, 2015Members:

Guy, Christelle Mae S.Haboc, Bea Armanie U.Herrella, Hannah Marie G. (Leader)Ilagan, Isabelle Louise F.Inumerable, Myzhel S.Jain, Natasha R.

EXPERIMENT #3 Specific Gravity of Liquids and Solids

ABSTRACT:

Density can be measured by dividing mass of a substance over its volume, while to compute for specific gravity, divide the density of a substance over the density of water (or any standard liquid). For this experiment, different measuring instruments were introduced. In calculating the specific gravity of the liquid sample (95% ethyl alcohol), the apparatuses used are: Baum Hydrometer, Mohr-Westphal Balance and Leach Pycnometer. As for the solid sample (copper sulfate), only pycnometer was used.

QUESTIONS AND ANSWERS:

1. Differentiate specific gravity and density.

Specific gravity is a ratio, expressed decimally, of the weight of a substance to the weight of an equal volume of a substance chosen as a standard, at the same temperature and conditions. On the other hand, density is defined as the ratio of mass (grams) to a unit volume (cm3) of matter.

2. If 54.96 mL of oil weighs 52.78 g, what is its specific gravity?

3. A pycnometer weighs 50.00 g. When filled with water, it weighs 100.00 g. When filled with oil, it weighs 94.00 g. Determine the specific gravity of the oil.

4. An insoluble powder weighs 12.00 g. A pycnometer, weighing 21.00 g when empty, weighs 121.00 g when filled with water. When the powder is introduced into the emptied pycnometer, and the pycnometer is filled with water, the three together weigh 130.00 g. What is the specific gravity of the powder?

Given:A. mass of empty pycnometer: 21.00 gB. mass of pycnometer with water: 121.00 gC. mass of pycnometer with water and powder: 130.00 gD. mass of pycnometer and powder: 21.00 g + 12.00 g= 33.00 g