Scientific amusements . vinegar-cooling process. dryness, and heated to expel the remaining tar and otherimpurities ; it is next mixed with sulphate of soda andwater, and the whole stirred together; the soda, now in CITRIC ACID. 165 union with the acetic acid, is washed out from the limeand strained quite clear; it is afterwards evaporated till itcrystallises, and vitriol (sulphuric acid) then added; finallythe acetic acid is distilled over, and the sulphuric acid leftin union with the soda, forming sulphate of soda, to beused in a similar process for the next batch of acid. Theacetic acid is
Scientific amusements . vinegar-cooling process. dryness, and heated to expel the remaining tar and otherimpurities ; it is next mixed with sulphate of soda andwater, and the whole stirred together; the soda, now in CITRIC ACID. 165 union with the acetic acid, is washed out from the limeand strained quite clear; it is afterwards evaporated till itcrystallises, and vitriol (sulphuric acid) then added; finallythe acetic acid is distilled over, and the sulphuric acid leftin union with the soda, forming sulphate of soda, to beused in a similar process for the next batch of acid. Theacetic acid is now quite colourless, transparent, and verysour, possessing a fragrant smell. This is not pure aceticacid, but contains a considerable quantity of water. Theacetic acid of commerce, mixed with seven times its bulk ofwater, forms an acid of about the strength of malt vinegar,perfectly wholesome, and agreeable as a condiment. Pure acetic acid may be made by mixing dry acetate ofpotash with oil of vitriol in a retort, and
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Keywords: ., bookcentury1800, bookdecade189, booksubjectscientificrecreations
