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December 9, 2010 20:25
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A 5 vol% ethanol solution needs to be converted to wt% for the table in the | |
CRC Handbook of Chemistry and Physics, 62nd Ed, pg D-207. | |
The density of pure alcohol is 0.791 times that of water at 20 C. | |
Basis 100 ml solution: | |
alcohol = 5x0.791 = 3.955 grams | |
water = 95x1.00 = 95.000 | |
Total = 98.955 g | |
Wt% alcohol = 3.955/98.955 = 0.0400 -> 4.00 wt% alcohol. | |
From table D-207 the freezing point depression is 1.65 C. The freezing temperature is then -1.65 C or 29.03 F. | |
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