Experiment No. 3: Specific Gravity
Determination of specific gravity is very essential in our study because it is commonly used in industry as a simple means of obtaining information about the concentration of solutions of various materials such as brines, sugar solutions and acids. There are many apparatuses that can be used to determine specific gravity depending on the material to be measured. The objectives of this experiment is to make acquainted the different instruments used to measure specific gravity and report measurements and calculations accurately. The materials used in this experiment are: pycnometer, Leach pycnometer, Baumme Hydrometer and Mohr Westphal balance. Specific Gravity of each material are then calculated using the values obtained. Guide Questions:
1. Differentiate specific gravity and density.
Specific gravity is the ratio of a material's density with that of water at 4 °C where it is most dense and is taken to have the value 999.974 kg·m-3) and is therefore a relative quantity with no units. Density is defined as mass per unit volume; it has the SI unit kg·m-3 and is an absolute quantity.
2. If 54.96 mL of oil weighs 52.78g. What is its specific gravity? SG= 52.7854.96
3. A pycnometer weighs 50.00g. When filled with water it weighs 100.00 g when filled with oil, it weighs 94.00 g. Determine the specific gravity of oil. Empty pycnometer(A)= 50.00 g
Pycnometer with water (B)= 100.00g
Pycnometer with oil (C)= 94.0
94.00g-50.00 g100.00g-50.00 g
44.00 g50.00 g= 0.8800
4. an insoluble powder weighs 12.00g. A pycnometer weighing 21.00 g when empty weighs 121.00 g when filled with water . When the powder is introduced, the three together weigh 130.00 g. What is the SG of the powder? Empty Pycnometer (A)= 21.00 g
Pycnometer with water(B)= 121.00 gx
Powder(C)= 12.00 g + 21.00 g = 33.00 g(empty pycnometer)
Pynometer, solid, standard liquid (D)= 130.00 g
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