SG using pycnometer
2. Density & Specific Gravity 2.1) Specific Gravity 2.1.2) SG - Pycnometer
2.1.2.1) SG using pycnometer Easy 1
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A 50 mL pycnometer is found to weigh 119 g when empty, 171.89 g when filled with water, and 176.1212 g when filled with polysorbate 80 . Calculate the specific gravity of polysorbate 80 .
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lb equals 1.08 kg
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Weight of the empty pycnometer = 119 g.
Weight of the pycnometer containing water = 171.89 g.
Therefore, the weight water = 171.89 - 119 = 52.89 g.
Weight of the pycnometer containing polysorbate 80 = 176.1212 g.
Therefore, the weight of the polysorbate 80 alone = 176.1212 - 119 = 57.1212 g.
The specific gravity of polysorbate 80 will be the ratio of the weight of polysorbate 80 and the weight of water. Therefore, the SG is 57.1212 / 52.89 = 1.08
Thefore, the answer is 1.08 (no unit).