Abstract
An apparatus is described that automatically performs the distillation necessary for determination of ethanol by the micro-dichromate method. if the sample is pipetted into an empty still, especially if it is warm, if too much Experiments show that results are low water is used in the still, or if the end point of the titration, which is difficult for an inexperienced analyst to see, is passed. Results are high it the K<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub> is impure, so primary-standard K<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub> is recommended. The importance of goodquality distilled water is discussed, and the calibration of volumetric glassware is emphasized. It is suggested that a standard ethanol-water solution be analyzed each day as a check on both analyst and the apparatus. Statistical analysis on 752 results recently obtained shows a standard deviation of ±0.075 for single determinations, a most probable error of ±0.036 for a single average result when duplicate determinations are made, and a standard deviation of ±0.10 at the 95% confidence limit.
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