Dairy Chemistry a Practical Handbook for Dairy Chemists And Others Having Contr
Dairy Chemistry a Practical Handbook for Dairy Chemists And Others Having Contr
Henry Droop Richmond
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23). This tube is weighed, after having been ignited gently, and the filtration is hastened by means of a water pump ; a small funnel is used to pour the solution into the tube. The precipitate of cuprous oxide is washed with boiling well-boiled water, and transferred to the tube. When the precipitate is washed well, the tube is sucked as dry 11 162 THE ESTIMATION OF SUGARS. as possible by the pump. It is then detached from the filter pump, and connected with a hydrogen apparatus, being clamped... in a horizontal position. A gentle current of hydrogen is passed through, and the tube heated cautiously by a small flame till all the cuprous oxide is reduced to metallic copper, and the tube is dry ; it is allowed to cool while the hydrogen is passed through slowly, and weighed. The increase of weight gives the amount of copper reduced. Table XXIX. Should be used to calculate the amount of hydrated milk-sugar from the copper. The table is used as follows : Look up in the table the weight of copper (expressed in milligrammes) nearest to the weight obtained, and calculate from this, by a proportion sum, the corresponding weight of milk-sugar.
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