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Thread: Help please! Science project question

  1. #1 Help please! Science project question 
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    I have done a experiment testing the ethanol content in a white wine sauce after different cooking periods by titrating it and have gotten odd results. The sauce contained a cup of 13% alcohol volume wine and a cup of chicken stock and an onion. It was prepared and frozen until I was ready to test it. When I tested it my 0 minute cooking time sample (the one the hadn't been heated at all) got a result of 2% where as i expected it to be at least 6% as I thought most of the ethanol would have still been present. Do have any idea why I might have gotten these results?


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  3. #2  
    Universal Mind John Galt's Avatar
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    Density contrasts of ethanol and water leading to a separation prior to or during the freezing process, with your test sample taken from a portion with low alcohol content.

    Just a suggestion.


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  4. #3  
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    Alcohol does not freeze, thus it might evaporate during sample handling.
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  5. #4  
    Forum Bachelors Degree
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    I don't know the answer, primarily because I could not inspect your experimental methods (control, multiple samples, standards, etc). Your reported 0 per cent result may be quite invalid. But assuming you did everything correctly, the next step by a true scientist would be to mince up the onion to see if it absorbed all the alcohol.
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