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It should be more like 6.63 / 0.75 = 8.84%. You have the same amount of alcohol in 75% of the volume.
How did you freeze the bock? In a keg? Jumped the remaining bock into another keg? How long did it take to freeze that portion? I have been wanting to do one for a few years but have yet to have my chest freezer open for the freezing stage.
My controller/sensor may be off by a degree or two.
Quote from: denny on October 11, 2015, 10:51:59 amMy controller/sensor may be off by a degree or two.I'd say it's right on. To a first-order approximation, every 1% ABW drops the freezing point by 1°F.http://www.engineeringtoolbox.com/ethanol-water-d_989.html